Surgical Management of a Pediatric Infratentorial Subdural Empyema as a Complication of Parapharyngeal Abscess.

Infratentorial empyema is a rare medical emergency typically presenting secondary to a middle ear infection. Nonspecific symptoms, limited access to radiological facilities, and imaging artifacts render this pathology prone to misdiagnosis and delayed intervention. An 11-year-old girl presented to the emergency department with a high fever, cervicalgia, and a two-week history of frontal headache. Computed tomography revealed parapharyngeal abscess and polysinusitis. Pus drained from the parapharyngeal abscess showed Staphylococcus capitis and Streptococcus intermedius. Treatment with intravenous meropenem and vancomycin led to initial improvement. On day five post drainage, she suddenly deteriorated with severe headache, vomiting, and posturing. Repeat CT showed posterior fossa empyema with hydrocephalus. The patient underwent an emergency suboccipital craniotomy for empyema evacuation. Pus cultures from the empyema showed identical results as those from the parapharyngeal abscess. Antibiotic therapy was continued for 12 weeks. The patient was discharged on day 21 after craniotomy with no neurological deficits. Early diagnosis and prompt neurosurgical evacuation combined with antibiotic therapy are of utmost importance to reduce morbidity and mortality. Physicians should consider the possibility of subdural empyema in children with parapharyngeal abscess and polysinusitis.