Lemierre's Syndrome (LS) Complicated by Cranial Nerve XII Palsy.

Lemierre's syndrome (LS) is a rare medical condition that involves an acute oropharyngeal infection leading to septic thrombophlebitis of the internal jugular vein with embolic spread to organs like the kidneys, lungs, and large joints. Only very little literature has reported central nervous system involvement with LS. This is a case of 34-year-old woman with right-sided neck pain, swallowing difficulties, and a sore throat of 3 days duration at the time of presentation. CT of the neck with contrast showed a ruptured right peritonsillar abscess and thrombus in the right internal jugular vein suspicious of thrombophlebitis. The patient was managed for LS with IV antibiotics and anticoagulation. However, her clinical course was complicated by cranial nerve XII palsy, which is an extremely rare manifestation of LS.