Cranial Subdural Empyema Due to Citrobacter koseri in a 96‐Year‐Old Immunocompromised Patient: Case Report

Subdural empyema (SDE) is a life‐threatening condition. Reports on SDE are scarce. We report the case of a 96‐year‐old immunocompromised patient on steroids for pemphigus who received repeat burrhole trephination and antibiotics to treat SDE. We identified Citrobacter koseri as the causative pathogen. Our patient made a good recovery at 2 months. We conclude that surgical treatment may yield a favorable outcome after cranial SDE, even in an elderly immunocompromised patient.