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Otogenic Lemierre’s Syndrome With Bilateral Metastatic Pneumonia: Report of an Unusual Case in a Male

Archives of Otorhinolaryngology-Head & Neck Surgery. 2021;6(1):5
DOI: 10.24983/scitemed.aohns.2022.00158
Article Type: Case Report

Abstract

Lemierre’s syndrome is a septic thrombophlebitis of the internal jugular vein and is often associated with oropharyngeal infections caused by Fusobacterium necrophorum. Otogenic Lemierre's syndrome has been reported to occur in the pediatric population, though such cases in adults are rare. In this report we describe a 27-year-old Bangladeshi male who presented to the emergency department with fever and cough for two days. He was febrile, hypotensive, tachycardic, and suffering from respiratory distress, which necessitated intubation and inotropes in the intensive care unit. Leukocytosis, an increased C-reactive protein marker, and thrombocytopenia were present. The blood cultures grew Enterococcus casseliflavus and Enterococcus raffinosus. To locate a gastrointestinal source, abdominal and pelvic computed tomography was performed, but the results were inconclusive. An enoxaparin treatment was initiated following a left internal jugular vein thrombosis detected during central line placement. Upon recurrence of spiking fevers, a computed tomography of the neck was performed, which demonstrated opacification of the left mastoid. An otoscopy revealed an external auditory canal purulence with grade 3 attic retraction. An audiogram revealed moderate to severe mixed hearing loss on the left side and type B tympanogram. The computed tomography and magnetic resonance imaging of the temporal bone revealed a left cholesteatoma with sigmoid sinus dehiscence, as well as gas locule formation in the sigmoid sinus and internal jugular vein. He had a left modified radical mastoidectomy in which the cholesteatoma was evacuated, the granulation around the sigmoid sinus was removed, and the pus around the sigmoid sinus was drained. His recovery was uneventful. In summary, the diagnosis of otogenic Lemierre's syndrome requires a high index of suspicion, particularly in obtunded patients, or in cases where language barriers obstruct detailed symptom assessment. The presence of internal jugular vein thrombosis should prompt further evaluation of the head and neck region for possible sources of infection.

Keywords

  • Cholesteatoma; fatal outcome; lateral sinus thrombosis; rare disease; thrombophlebitis

Introduction

Lemierre’s syndrome manifests as thrombophlebitis of the internal jugular vein caused by anaerobic bacteria, particularly Fusobacterium necrophorum [1]. In general, Lemierre's syndrome occurs following oropharyngeal infections, while cases of otogenic Lemierre's syndrome precipitated by acute otitis media and mastoiditis have been reported in pediatric patients [2], but such cases are rare in adults. Lemierre's syndrome can also be a life-threatening condition owing to the possibility of metastatic infection affecting many organ systems and the consequential risk of severe sepsis [3]. Our case report describes an adult with otogenic Lemierre's syndrome complicated by metastatic severe bilateral pneumonia presenting with atypical symptoms and requiring aggressive surgical and antibiotic treatment.

Case Report

A 27-year-old Bangladeshi male presented with a 2-day history of productive cough, fever, pleuritic chest pain, and dyspnea. The patient was febrile (body temperature of 38.3°C) and hypotensive (systolic blood pressure of 90 mmHg), tachycardic (a heart rate of 120–130 beats per minute) and suffering from respiratory distress (a respiration rate of 30–35 breaths per minute). His blood analysis indicated leukocytosis (white blood cell count of 22.1 x 109/L), an elevated C-reactive protein level (206 mg/L), thrombocytopenia (platelet count of 25 x 109/L) and Type 1 respiratory failure (arterial blood gas). An X-ray of the chest showed bilateral lower zone opacities indicative of pneumonia. Prophylactic endotracheal intubation and inotropic support were required for septic shock, and he was transferred to the intensive care unit.

Following initial blood culture results showing Enterococcus casseliflavus and Enterococcus raffinosus, empirical Meropenem and oral Doxycycline were replaced with Imipenem and Daptomycin. Computed tomography scans of the abdomen, pelvis, and thorax revealed extensive consolidative ground glass changes in the bilateral lower lung fields that were consistent with severe bilateral pneumonia. However, other possible septic foci were not found. There was no evidence of infective endocarditis on a transthoracic echocardiogram. During the insertion of the central line, an incidental left internal jugular vein thrombosis was noted; therefore, therapeutic anticoagulation with subcutaneous Enoxaparin was initiated.

Persistent intractable fever despite 9 days of culture-directed antibiotics prompted repeat blood cultures which grew pan-sensitive Proteus mirabilis. A subsequent examination of the full body included a computed tomography of the neck, which revealed a left mastoid opacification in conjunction with an ipsilateral filling defect in the internal jugular vein, indicating venous thrombosis (Figure 1A).

 

Figure 1. Preoperative and postoperative images. (A) A computed tomography scan of the neck demonstrates an internal jugular vein thrombosis with a filling defect on the left side. (B) A computed tomography of the temporal bone reveals a cholesteatoma in the left middle ear along with a gas locule in the sigmoid sinus (indicated by the star). (C) There was no venous flow on magnetic resonance venography of the dural venous sinuses, indicating thrombosis of the left jugular bulb and the sigmoid sinus (labelled with a star). (D) Obtaining a computed tomography image of the temporal bone postoperatively demonstrates the complete removal of the left middle ear cholesteatoma and the disappearance of gas within the sigmoid sinus.

 

Extubation was completed and the patient was transferred to the general ward. An examination by the otolaryngology team revealed that the patient had chronic intermittent left otalgia, otorrhea, and a long-standing hearing loss on the left. There was no history of giddiness or disequilibrium. An otoscopic examination revealed purulent discharge from the left external auditory canal and grade 3 pars flaccida retraction of the eardrum without squames. Despite being opaque, the pars tensa of the eardrum remained intact. The post-auricular region did not exhibit subcutaneous edema (negative Griesinger's sign). A complete neuro-otologic examination did not reveal any abnormal findings. In the pure tone audiometry study, a moderate-to-severe mixed hearing loss was detected on the left side (Figure 2). In the tympanometry study, the left tympanogram was of type B. An aerobic ear canal swab was found to grow pan-sensitive Pseudomonas aeruginosa and Bacteroides fragilis.

 

Figure 2. At the time of diagnosis, a pure tone audiogram reveals a moderate to severe mixed hearing loss in the left ear.

 

This patient underwent urgent computed tomography of the temporal bone, which revealed opacification of soft tissue in the left middle ear along with extensive erosions of the left ossicular chain, tegmen tympani, and sigmoid plate, suggesting cholesteatoma with coalescent mastoiditis (Figure 1B). Additionally, the thinned bone overlying the mastoid facial nerve canal indicated the presence of dehiscence. There were also gas locules within the sigmoid sinus (Figure 1B). Additional imaging with magnetic resonance imaging of the head revealed that there was a left cholesteatoma without any encephalocele, however, there was a reactive enhancement of the facial nerve. The absence of venous flow on magnetic resonance venography of the dural venous sinuses indicated thrombosis of the left jugular bulb and sigmoid sinus (Figure 1C).

The patient underwent an urgent left modified radical mastoidectomy and meatoplasty. A large middle ear cholesteatoma was discovered intraoperatively, which extended posteriorly into the mastoid antrum (Figure 3A). It was observed that extensive granulation tissue surrounded the suprastructure of the stapes, along with erosion of the malleus head and the incus. The tegmen mastoideum was found to be eroded with a dehiscent mastoid facial nerve segment. Along the course of this nerve, there was a stimulation response of 0.8 mA. The sigmoid sinus plate was extensively eroded by cholesteatoma, with granulation observed on the edematous wall of the sinus (Figure 3B). The thrombus was palpable within the sigmoid sinus, despite pulsations being felt proximally. Purulence was evident in the peri-sigmoid region (Figure 3C).

 

Figure 3. Images obtained during surgery. (A) A cholesteatoma is present in the left middle ear (labelled with a letter C), as well as a tegmen mastoideum defect and the exposed dura (indicated with a letter D). (B) A sigmoid sinus that has been exposed (marked with a letter S), while granulations have been removed from the peri-sigmoid area. (C) Purulence in the sigmoid sinus (indicated with a letter S) observed during instrumentation of the peri-sigmoid region (marked with a star).

 

After the surgery, the patient recovered well without developing wound infections, facial palsy, or dizziness. The intraoperative tissue cultures grew Proteus mirabilis, Pseudomonas aeruginosa, and Enterococcus raffinosus. Histological analysis confirmed the diagnosis of cholesteatoma. The postoperative computed tomography imaging of the temporal bone showed complete clearance of the cholesteatoma, with no residual collections or gas locules (Figure 1D). The C-reactive protein and leukocyte counts were normal following surgery. After surgery, the patient was treated with culture directed Cefepime and oral Metronidazole for two weeks. In addition, he developed peripherally inserted central catheter-related thrombosis of the right arm, which required its removal. Cultures of peripherally inserted central catheter tips were negative.

On discharge from the hospital, his antibiotics were replaced with oral linezolid and ciprofloxacin, and his anticoagulant was replaced with Rivaroxaban. He was followed up outpatient for two months following discharge, completed his antibiotic therapy and recovered without complications.

Discussion

The diagnosis of Lemierre's syndrome usually requires a history of recent head and neck infections (e.g., tonsillitis and pharyngitis), radiological evidence of septic thrombophlebitis of the internal jugular vein, and the detection of anaerobic pathogens, generally Fusobacterium necrophorum [1]. Lemierre's syndrome is a rare disorder, with an incidence rate ranging from 0.6 to 2.3 cases per million people. An even rarer form of this condition is the otogenic Lemierre's syndrome, which can manifest after acute otitis media, mastoiditis, or sporadically after an acutely infected cholesteatoma in children. In adults, however, otogenic Lemierre's syndrome is less well documented. The onset of otogenic Lemierre's syndrome is associated with septic pulmonary microemboli, in a way similar to Lemierre's syndrome, which is characterized by pulmonary metastatic infections in about 85% of patients [3].

Uncommon bacteriology in Lemierre's syndrome may contribute to diagnostic delays. Healy et al. described a case of bacteremia involving Enterococcus and Escherichia coli, which delayed the diagnosis of Lemierre's syndrome because blood cultures commonly reveal Fusobacterium necrophroum [4]. Other pathogens that may be responsible for otogenic Lemierre's syndrome include Bacteroides and Proteus species. In addition, Fusobacterium necrophroum usually takes six to eight days to incubate; this may also contribute to a delay in diagnosing Lemierre's syndrome. In our patient, after starting an empiric course of antibiotic treatment for severe bilateral pneumonia and septic shock, the blood cultures for Enterococcus raffinosus and Proteus mirabilis were positive, as were the intraoperative tissue cultures for Enterococcus raffinosus, Proteus mirabilis, and Pseudomonas aeruginosa. Since these bacteria are uncommonly associated with Lemierre's syndrome, it was not possible to make a diagnosis of Lemierre's syndrome. Therefore, we searched for alternative causes of bacteremia (e.g., respiratory and gastroenterological origins), resulting in a delay in diagnosis [5].

In retrospect, our patient had a jugular vein thrombosis discovered during central catheterization. This finding should have prompted further investigation for evidence of a septic focus in the head and neck. The infection was likely to have developed prior to the insertion of the central catheter and may have been an active ongoing condition in the head and neck. In the present case, it is believed that the infected cholesteatoma coalesced into a peri-sinus abscess, leading to sigmoid sinus thrombosis that then spread into the internal jugular vein [6]. Delay in the definitive management of the infected ear may result in local complications such as profound sensorineural hearing loss and intracranial infection, as well as life-threatening septic shock or mortality [2,7].

Depending on the severity of the condition, treatment of otogenic Lemierre’s syndrome may include aggressive surgical eradication and culture-directed intravenous antibiotic therapy. The infected cholesteatoma in our patient caused local septic thrombosis and bacteremia, both of which were unlikely to be resolved by conventional antibiotic therapy alone. As a result, mastoidectomy was indicated to clear the infection source within the middle ear and peri-sigmoid area. There has been considerable variation in the degree of surgical treatment based on intraoperative findings among various authors. Desphegel et al. reported two cases of middle ear granulation tissue and osteitis treated simply by cortical mastoidectomy and the insertion of a ventilation tube [8], whereas Stokroos et al. reported a case requiring repeat exploratory mastoidectomy and internal jugular vein ligation after initial mastoidectomy due to sigmoid sinus thrombosis [9]. The key principles of treatment are to ensure adequate middle ear ventilation, control infection sources, and perform an early surgical intervention.

The role of anticoagulation therapy in Lemierre's syndrome is primarily to minimize the spread of the septic thrombosis that has formed within the internal jugular vein into the intracranial space. In a systematic review conducted by Schulman et al., it was concluded that anticoagulation was associated with lower risks of both venous thromboembolism and septic thrombi, while bleeding risk did not significantly differ from that of untreated patients [10]. As in our patient, anticoagulation combined with surgical clearance of infection facilitated resolution of the septic thrombus within the internal jugular vein thrombus. There were no bleeding complications perioperatively, further validating anticoagulation's role in the treatment of Lemierre's syndrome.

Lemierre's syndrome is a highly treatable disease in modern times, with antibiotics playing a key role in dramatically reducing mortality rates from 90% in the pre-antibiotic era to 4–18% today [11]. In cases of otogenic Lemierre's syndrome, the optimal treatment may include a combination of antibiotic therapy and surgical intervention, as was the case here. Even though more than half of Lemierre's syndrome patients require admission to intensive care units, accurate early diagnosis is crucial for implementing appropriate supportive treatment and reducing long-term morbidity and mortality. In light of this, physicians should be aware of Lemierre's syndrome as a rare but potentially life-threatening condition, which is eminently treatable.

If a patient is unable to provide detailed information about their past due to respiratory failure requiring intubation, or if a language barrier is present, an investigative history through other methods and a complete physical examination must still be performed, as the delay in diagnosis may have severe consequences. By conducting a thorough physical examination and history taking, a clinician can better guide the clinical pursuit of septic foci and avoid the need to rely on overburdened imaging or antimicrobial resources within a public healthcare system.

Conclusion

In patients with severe bilateral pneumonia, atypical organisms to be identified in their blood cultures, and who do not respond to empirical antibiotic therapy, a high index of suspicion for Lemierre's syndrome is required. Additionally, internal jugular vein thrombosis may indicate otogenic Lemierre's syndrome, and further investigation should be conducted to identify potential septic foci in the head and neck region.

References

  1. Lemierre A. On certain septicaemia due to anaerobic organisms. The Lancet 1936;227(5874):701-703. [View Article]
  2. Masterson T, El-Hakim H, Magnus K, Robinson J. A case of the otogenic variant of Lemierre's syndrome with atypical sequelae and a review of pediatric literature. Int J Pediatr Otorhinolaryngol 2005;69(1):117-122. [View Article]
  3. Lee WS, Jean SS, Chen FL, Hsieh SM, Hsueh PR. Lemierre's syndrome: A forgotten and re-emerging infection. J Microbiol Immunol Infect 2020;53(4):513-517. [View Article]
  4. Healy B, Llewelyn M, Cavalle F, Bernard M. Lemierre's syndrome in association with a cholesteatoma. Br J Hosp Med (Lond) 2007;68(6):330-331. [View Article]
  5. Syed MI, Baring D, Addidle M, Murray C, Adams C. Lemierre syndrome: Two cases and a review. Laryngoscope 2007;117(9):1605-1610. [View Article]
  6. Viswanatha B, Naseeruddin K. Lateral sinus thrombosis in otology: A review. Mediterr J Hematol Infect Dis 2010;2(3):e2010027. [View Article]
  7. Roos M, Harris T, Seedat R. Fatal Lemierre's syndrome as a complication of chronic otitis media with cholesteatoma. S Afr J Child Health 2016;10(4):231-232. [View Article]
  8. Despeghel A, Samoy K, D'heygere E, Casselman J, Lerut B, Kuhweide R. Otogenic Lemierre syndrome: Clinical diagnosis and urgent mastoidectomy. B-ENT 2019;15:147-153. [View Article]
  9. Stokroos RJ, Manni JJ, de Kruijk JR, Soudijn ER. Lemierre syndrome and acute mastoiditis. Arch Otolaryngol Head Neck Surg 1999;125(5):589-591. [View Article]
  10. Schulman S. Lemierre syndrome - treat with antibiotics, anticoagulants or both? J Intern Med 2021;289(3):437-438. [View Article]
  11. Karkos PD, Asrani S, Karkos CD, et al. Lemierre's syndrome: A systematic review. Laryngoscope 2009;119(8):1552-1559. [View Article]

Editorial Information

Publication History

Received date: January 25, 2022
Accepted date: February 10, 2022
Published date: March 02, 2022

Author Contributions

Writing, content analysis, and formatting of manuscripts by Pei Yuan Fong; writing and content analysis of manuscripts by Yew Meng Chan and Joyce Zhi’en Tang.

Ethics Approval and Consent to Participate

The study is in accordance with the ethical standards of the 1964 Helsinki declaration and its later amendments or comparable ethical standards. According to the Centralized Institutional Review Board (CIRB) Guidelines for SingHealth, this case report was exempt from research approval.

Publication Consent

A consent was obtained from the patient prior to the use of de-identified patient data for academic and educational purposes, including publication in a journal.

Availability of Data and Materials

Data sharing does not apply to this article since no datasets were generated or analysed during the current study.

Funding

This research has received no specific grant from any funding agency either in the public, commercial, or not-for-profit sectors.

Conflict of Interest

There are no conflicts of interest declared by either the authors or the contributors of this article, which is their intellectual property.

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Department of Otolaryngology, Singapore General Hospital, Singapore
Department of Otolaryngology, Singapore General Hospital, Singapore
Department of Otolaryngology, Singapore General Hospital, Singapore
Department of Otolaryngology, Singapore General Hospital, Singapore

Address: 20 College Road, Level 5 Academia, Singapore 169856
Figure 1.png
Figure 1. Preoperative and postoperative images. (A) A computed tomography scan of the neck demonstrates an internal jugular vein thrombosis with a filling defect on the left side. (B) A computed tomography of the temporal bone reveals a cholesteatoma in the left middle ear along with a gas locule in the sigmoid sinus (indicated by the star). (C) There was no venous flow on magnetic resonance venography of the dural venous sinuses, indicating thrombosis of the left jugular bulb and the sigmoid sinus (labelled with a star). (D) Obtaining a computed tomography image of the temporal bone postoperatively demonstrates the complete removal of the left middle ear cholesteatoma and the disappearance of gas within the sigmoid sinus.
Figure 2.png
Figure 2. At the time of diagnosis, a pure tone audiogram reveals a moderate to severe mixed hearing loss in the left ear.
Figure 3.png
Figure 3. Images obtained during surgery. (A) A cholesteatoma is present in the left middle ear (labelled with a letter C), as well as a tegmen mastoideum defect and the exposed dura (indicated with a letter D). (B) A sigmoid sinus that has been exposed (marked with a letter S), while granulations have been removed from the peri-sigmoid area. (C) Purulence in the sigmoid sinus (indicated with a letter S) observed during instrumentation of the peri-sigmoid region (marked with a star).

Reviewer 1 Comments

  1. A report about a rare variant of Lemierre's syndrome is presented in this article. A wide range of symptoms are present in such a wide range of specialties that it becomes even more difficult to identify at the beginning. Because of this, clinicians are often unable to recognize Lemierres Syndrome until complications from metastatic spread occur, which may be dangerously late in the course of treatment. Considering the case report in this article, it is essential for clinicians to identify Lemierres Syndrome as soon as possible for purposes of preventing long term morbidity and mortality. In my opinion, the case report raises some interesting issues, but some need to be addressed.
    ResponseThank you for these valuable comments.
     
  2. According to the case report, initial positive blood cultures included E. raffinosus and P. mirabilis. Both pathogens were identified in intraoperative tissue cultures. Ultimately, the authors concluded that the polymicrobial bacteriology of otogenic Lemierre's syndrome contributed to a diagnostic delay. It is imperative to note, however, that antimicrobial susceptibility testing of anaerobes can be challenging even in specialized anaerobic laboratories (Syed et al. Laryngoscope. 2007;117(9):1605-10). The negative culture results should not be a basis for delaying the diagnosis and treatment. Further clarification of this point is necessary in the Discussion.
    ResponseThank you for your valuable comment. Indeed, the failure to culture any significant anaerobe in the blood cultures should not be a reason to delay diagnosis and treatment. In fact, broad spectrum antibiotics were commenced from the very beginning (Meropenem and later Imipenam), which have anaerobic coverage. What we had intended to convey is that because the prototypical bacteria for LS (Fusobacterium), but our patient had E. raffinosus and P. mirabilis, the hunt for the primary source of infection was directed towards the gastrointestinal system. We have amended paragraph 1 of Discussion to better reflect this. Paragraph 2 of Discussion also acknowledges that detection of the IJV thrombus was a significant finding that should have prompted the diagnosis of LS, which was unfortunately missed. This manuscript has been revised from line 167 to line 180. Here is how the revisions have been made: Uncommon LS bacteriology may contribute to diagnostic delays. Healy [4] reported a case of Enterococcus and E.coli bacteremia delaying LS diagnosis, noting that causative organisms typically outgrow Fusobacterium in blood cultures. Fusobacterium necrophroum routinely requires 6-8 days to incubate. In otogenic LS, other pathogens may include Bacteroides, E.coli and Proteus species. In our patient, empiric treatment of severe bilateral pneumonia with septic shock was initiated. Thereafter, initial positive blood cultures included E. raffinosus and P. mirabilis. Both pathogens were later identified in intraoperative tissue cultures (E. raffinosus, P. mirabilis, and Pseudomonas aeruginosa). As these bacteria are not commonly associated with LS, there was a diagnostic delay stemming from the pursuit of other foci of bacteremia [5], including respiratory and gastrointestinal sources. In retrospect, the IJV thrombosis detected during central catheter insertion should have prompted further evaluation for a head and neck septic focus. It was likely to have developed prior to central catheter insertion, suggesting an active ongoing infection of the head and neck region.
     
  3. Lemierre's syndrome was associated with a 90% death rate during the pre-antibiotic era. There have been significant improvements in the treatment of this disease since the introduction of empiric antibiotic therapy, with the primary cause of death being a delayed diagnosis. To reduce long-term morbidity and mortality associated with Lemierre's syndrome, the most vital part of managing it in the modern medical community is for physicians to be aware of this rare, yet life-threatening condition as soon as possible so that early treatment can be achieved. The point is important and should be stressed in this case report.
    ResponseThank you for your valuable comment. Apart from mentioning it in the Discussion, we have amended the Conclusion for clarity. This manuscript has been revised from line 216. Here is how the revisions have been made: Delay in diagnosing otogenic Lemierre's syndrome may have severe consequences. A high index of suspicion in cases with severe bilateral pneumonia and atypical blood cultures should prompt comprehensive evaluation for the primary source of metastatic infection, and IJV thrombosis should raise the possibility of LS, and direct the search to the head and neck region, which should include an otoscopy to diagnose otogenic LS. Though our patient was unable to provide details of his symptoms due to initial respiratory failure and intubation, and subsequently when extubated due to language barriers, thorough history taking and complete physical examination is mandatory in patients with severe sepsis where possible. This can guide clinical pursuit of septic foci and alleviate excessive reliance on overburdened imaging or antimicrobial resources in a public healthcare system. A systematic yet rapid evaluation of septic foci should be conducted, including that of the head and neck, should patients not respond to empirical antibiotic therapy. Prompt multimodality treatment including surgical eradication of infective foci is mainstays of effective treatment.
     
  4. There should be a brief description of Lemierre's syndrome in the Discussion. As an example, the diagnosis of Lemierre's syndrome s based on a recent infection history, radiological evidence of jugular vein thrombosis, and the isolation of anaerobic pathogens, primarily Fusobacterium necrophorum. The incidence rate for Lemierre's syndrome as been shown to range between 0.6 and 2.3 cases per million individuals. Most cases presented during the second decade of life (51%), followed by the third decade (20%), and then the first decade (8%). The mortality rate was as high as 90% during its first described periods and decreased to 4 to 18% with the widespread use of antibiotics. Tonsils, pharynx, and chest are the main sources of infection, followed by the larynx and middle ear. Approximately 58% of patients required admission to the intensive care unit for a median of 21 days. Hospital stays ranged from 4 to 112 days (median, 25 days). Various treatment methods were employed, including antimicrobial, anticoagulant, surgical or a combination of these methods. More references may be found in the articles published by Karkos et al. (Laryngoscope. 2009 Aug;119(8):1552-9), Syed et al. (Laryngoscope. 2007 Sep;117(9):1605-10, and Turan et al. (Case Rep Emerg Med. 2014;2014:208960).
    ResponseThank you for your valuable comment. We have expanded the description in the Discussion. This manuscript has been revised from line 158 to line 164. Here is how the revisions have been made: Lemierre's syndrome is typically diagnosed based on history of recent head and neck infection (e.g. tonsillitis, pharyngitis), radiologic evidence of internal jugular vein septic thrombophlebitis and isolation of anaerobic pathogens, classically F. necrophorum [1]. LS is rare, with an incidence rate ranging between 0.6 and 2.3 cases per million individuals. Otogenic LS is even rarer, and not well described in adults. Paediatric otogenic LS reports describe sequelae of acute otitis media and mastoiditis, and sporadically following acutely infected cholesteatoma. In addition, this manuscript has also been revised from line 206 to line 213. Here is how the revisions have been made: LS in modern practice is an eminently treatable disease, with antibiotic therapy as a cornerstone of treatment drastically reducing mortality from 90% in the pre-antibiotic era to between 4-18% currently [11]. In otogenic LS, optimal treatment may comprise a combination of antibiotic therapy and surgical intervention, as in our case. While more than half of LS patients require admission to intensive care units as part of their management, accurate early diagnosis is key to instituting appropriate supportive treatment and reducing long term morbidity and mortality. It is therefore vital for physicians to attain awareness of LS as a rare and potentially life-threatening disease, which is eminently treatable. 

Reviewer 2 Comments

  1. As in this case, the patient had a long delay in seeking treatment for chronic middle ear infection, with otorrhea lasting over 20 years on average. This chronic middle ear infection was complicated by cholesteatoma, which led to Lemierre's syndrome. Compared to the predominant pediatric patient profiles described in current literature, this case is unique. In particular, the present case report describes an unusual presentation of severe bilateral pneumonia and sepsis, which initially delayed the diagnosis, but fortunately did not significantly impede the patient's recovery. It is an exceptional report that advances medical knowledge. However, there are certain points that need to be clarified.
    ResponseThank you for the kind comments.
     
  2. The current medical condition was not clearly described. Specific information regarding the clinical presentation and examination should be provided. For example, the patient was febrile, hypotensive, tachycardic, and in respiratory distress. Clinical data should be provided in support of these conditions. Also, he had raised leukocyte count (22K) and Type 1 respiratory failure on arterial blood gas. It is more appropriate to give the precise number of leukocytes rather than a rough estimate, as well as the unit of leukocyte count. Additionally, what are the exact results of C-reactive protein marker and platelets that are associated with Lemierre's syndrome?
    ResponseThank you, the exact clinical vital signs at presentation and relevant lab values have been added. This manuscript has been revised from line 96 to line 101. Here is how the revisions have been made: A 27-year-old Bangladeshi male presented with a 2-day history of productive cough associated with fever, pleuritic chest pain and dyspnea. He was febrile (T 38.3 °C), hypotensive (systolic BP 90s), tachycardic (heart rate 120-130s), and in respiratory distress (respiratory rate 30-35). He had raised leukocyte count (22.1 x 109/L), elevated C-reactive protein marker (206mg/L) and thrombocytopenia (platelets 25 x 109/L ) and Type 1 respiratory failure on arterial blood gas.
     
  3. The authors stated that the internal jugular vein thrombosis detected during central catheter insertion should have prompted further evaluation for a head and neck septic focus. Nevertheless, the patient developed a peripherally inserted central catheter (PICC)-related thrombosis in his right arm after the diagnosis was made. Further, catheter malpositioning is one of the major causes of PICC-related venous thrombosis. In the event that the catheter tip leaves the superior vena cava and migrates into a vein outside of the superior vena cava, blood vessel wall damage may occur, eventually resulting in thrombosis (Wang K et al., Medicine (Baltimore) 2017;96(51):e9222). Therefore, venous thrombosis related to PICCs is not necessarily indicative of Lemierre's syndrome. Discussion is required to address this issue.
    ResponseThank you for your kind comment. May we explain that the IJV thrombosis was noted during central catheter insertion, suggesting that it had been present and formed prior to the catheter insertion. As such, it should have prompted the clinical team to pursue a septic thrombus of head and neck infective origin. This has been clarified in Lines 177-180. The PICC was inserted because they could not insert the CVC, and subsequently there was PICC associated thrombus, but this is unrelated to LS per se. This manuscript has been revised from line 177 to line 180. Here is how the revisions have been made: In retrospect, the IJV thrombosis detected during central catheter insertion should have prompted further evaluation for a head and neck septic focus. It was likely to have developed prior to central catheter insertion, suggesting an active ongoing infection of the head and neck region.
     
  4. Surgery is a critical component of management for the most severe cases of Lemierre's syndrome, and the specific surgical subspecialist that should be consulted depends heavily on the location of the septic emboli. It has been reported that close to 70% of patients have undergone some type of surgical intervention, such as the treatment of periodontal disease or the incision and drainage of an abscess, in addition to otolaryngology and oculoplastic procedures. There is a need for the authors to discuss further the indications for surgery in patients with Lemierre's syndrome.
    ResponseThank you, further elaboration on surgical indications and details of extent of surgical intervention have been included in Lines 186-197. Here is how the revisions have been made: Treatment of otogenic LS may involve aggressive surgical eradication and culture-directed intravenous antibiotic treatment. In our patient, upfront surgical infective clearance via mastoidectomy was indicated as the infected cholesteatoma had already caused local septic thrombosis and bacteremia, which was unlikely to resolve with antibiotic thereapy alone. Our team achieved comprehensive surgical infective clearance of the middle ear cholesteatoma and peri-sigmoid purulence. Various authors report differing extent of surgical treatment based on intraoperative findings. Desphegel [8] reported 2 cases of intraoperative middle ear granulation tissue and osteitis treated sufficiently with only cortical mastoidectomy and ventilation tube placement, while Stokroos [9] reported a case which required repeat exploratory mastoidectomy and IJV ligation due to progressive sigmoid sinus thrombosis following initial mastoidectomy. Key principles include adequate middle ear ventilation, source control, and early surgical intervention.

Reviewer 3 Comments

  1. Lemierre's syndrome may have an unclear clinical diagnosis due to the low incidence and broad range of symptoms associated with it, as well as clinicians' unfamiliarity with it. This article demonstrates how communication between different specialties is essential for rapidly diagnosing the syndrome, which enables prompt treatment with antibiotics, anticoagulants, and surgical intervention. It is a well written report that may be considered for publication after addressing some issues.
    ResponseThank you for your comments.
     
  2. In the Introduction, relevant background studies should be used to describe the current state of research in that particular field. In addition, the authors should explain their reasoning for reporting the case at the end of the Introduction section.
    ResponseThank you, the Introduction has been expanded to include relevant background studies and the unique nature of our reported case. We have decided to use the introduction section to lend context to the disease entity, summarise the salient points of our reported case, before progressing into the case report description thereafter. This has been addressed in Lines 88-93 as follows: LS Is also recognized as a potentially life-threatening disease due to potential for metastatic infection affecting multiple organ systems and severe sepsis [3]. We report a case of adult otogenic LS complicated by metastatic severe bilateral pneumonia, presenting with atypical symptoms and associated with atypical causative organisms, which eventually required aggressive surgical and antibiotic treatment.
     
  3. A repeat full-body imaging confirmed the diagnosis of Lemierre's syndrome following persistent intractable fever despite 9 days of antibiotic treatment. In my opinion, an early and comprehensive screening of the fever source, especially in the ENT category, can facilitate the identification and timely treatment of Lemierres Syndrome in this patient. Furthermore, careful history taking and physical examination with a focus on detecting fever sources may help to preserve the imaging and antibiotic resources of overburdened healthcare systems. This is the true educational value of the case report. Discussion of the lessons or experiences that may be learned from the case report should be included.
    ResponseThis has been included and addressed in the Conclusion in Line 222 to line 227 as follows: Thorough history taken and complete physical examination is mandatory in patients with severe sepsis, where possible. This can guide clinical pursuit of septic foci and alleviate excessive reliance on overburdened imaging or antimicrobial resources in a public healthcare system. A systematic yet rapid evaluation of septic foci should be conducted, including that of the head and neck, should patients not respond to empirical antibiotic therapy.
     
  4. There is currently no consensus regarding the advantages of anticoagulation therapy in managing Lemierre's syndrome. Approximately 30% of patients in the literature received anticoagulation treatment. Due to the low incidence of the disease, the risks and benefits of anticoagulation therapy have not been adequately assessed in a controlled clinical study. Therefore, it is difficult to determine a true cost-benefit ratio for providing anticoagulation therapy. Most anticoagulation therapies are based on individual preferences, experience, or departmental protocols rather than robust evidence. Nevertheless, it has been suggested that more aggressive treatment strategies may be required for thrombosis in more severe sites, such as the cavernous sinus. There is a need for further discussion of these points.
    ResponseThank you, a further paragraph has been included in Lines 198-204 to discuss these points as follows: The role of anticoagulation in LS is primarily to minimize propagation of the IJV septic thrombus intra-cranially. In a systematic review, Schulman et al [10] concluded that anticoagulation was associated with lower risks of venous thromboembolism and septic thrombi, while bleeding risk was not significantly increased compared to untreated patients. In our patient, anticoagulation in tandem with surgical clearance of infection facilitated resolution of the IJV septic thrombus, and no bleeding complications were encountered peri-operatively, supporting the above role of anticoagulation in LS treatment.

Editorial Comments

  1. The patient presented with a 2-day history of productive cough associated with fever, pleurisy and dyspnea. Pleurisy is a sign rather than a symptom, and as such this term should be revised.
    ResponseThank you, this has been revised in Line 97 as follows: A 27-year-old Bangladeshi male presented with a 2-day history of productive cough associated with fever, pleuritic chest pain and dyspnea.
     
  2. Pure-tone audiogram revealed a left sided moderate-to-severe mixed hearing loss and Type B tympanogram (Figure 2). In Figure 2, however, the presence of a Type B tympanogram could not be found.
    ResponseThis has been appropriately referenced. The finding of a Type B tympanogram was a written report in our department, hence there is no diagram to be included.
     
  3. Please describe the duration of the follow-up in the Case Report section.
    ResponseThis has been included in Lines 154-155 as follows: The patient was reviewed outpatient up to 2 months post-discharge, completed his antibiotic therapy and recovered uneventfully.

Fong PY, Chan YM, Tang JZ. Otogenic Lemierre’s syndrome with bilateral metastatic pneumonia: Report of an unusual case in a male. Arch Otorhinolaryngol Head Neck Surg. 2021;6(1):5. https://doi.org/10.24983/scitemed.aohns.2022.00158