Intracranial Abscess and Proteus mirabilis: A Case Report and Literature Review

An intracranial abscess caused by Proteus mirabilis is rarely reported in adults. A 17-year-old girl presented with generalized tonic-clonic seizure, high-grade fever, headache, and vomiting with a history of slowly progressing apathy, clumsiness, and disorientation. She had meningeal signs and altered sensorium with a Glasgow Coma Scale of 10. The laboratory analysis revealed leukocytosis and elevated erythrocyte sedimentation rate. Brain computed tomography (CT) revealed a cystic lesion in the left temporal lobe with perilesional edema and a slight midline shift. She was commenced on empiric ceftriaxone, amikacin, and metronidazole. The non-foul smelling pus was drained through a craniotomy, and pus culture showed P. mirabilis. Culture sensitivity revealed extended-spectrum B-lactamase production, and she was commenced on intravenous carbapenem in addition to existing drugs. A repeat CT revealed a significant reduction in abscess size, and improvement in her condition was observed. On her recent follow-up visit, she was doing well.