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A previously healthy, 35-year-old, immunocompetent man presented with a 2-day history of sore throat and unilateral swelling of the right neck. The patient was found to be tachycardic and pyrexic on clinical examination.
Lemierre syndrome is the sequela of acute pharyngotonsillitis. The cause is often the anaerobe Fusobacterium necrophorum.1 Patients present with septicaemia and a preceding history of upper respiratory tract infection. The infection primarily affects the palatine tonsils, spreading along the fascial planes into the carotid space resulting in thrombophlebitis of the internal jugular vein.1
The discovery of a thrombosed internal jugular vein on imaging is crucial in making the diagnosis. The first-line imaging of choice is ultrasound. This demonstrates the expansion of the internal jugular vein by thrombus, together with incompressibility and absent Doppler flow (figure 1). Precontrast and postcontrast CTs of the neck would confirm a central filling defect in keeping with thrombus formation, with fat stranding in the adjacent carotid space.2 MRIs reveal enhancement of the venous wall and surrounding fat within the ipsilateral carotid sheath (figure 2).
The diagnosis is a combination of these radiological findings together with a history of recent pharyngotonsillitis and culture of an anaerobic bacterium.
Aggressive antimicrobial therapy together with anticoagulation is the treatment of choice.3 Untreated, septic emboli may develop with consequent infarcts or abscesses. This usually affects the lungs and joints, however, any organ can be affected. This condition should be kept in mind when dealing with complicated upper respiratory tract infections.
Early recognition of the condition is vital to prevent serious complications.
Radiological investigation is paramount in confirming the diagnosis.
The key finding is internal jugular vein thrombophlebitis.
Contributors CA performed the literature review and drafted the write up of the article. RG and AM made the radiological diagnosis of the case and reported the imaging findings.
Competing interests None.
Patient consent Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.