Malignant otitis externa (MOE) is an aggressive but benign entity which evolves into skull base osteomyelitis. An 81-year-old female patient was admitted for left hemiparesis and homonymous hemianopia. She complained of headache radiating to the right cervical area. A recent history of recurrent otitis media was present. Head and neck imaging showed an ischemic infarction (right temporo-occipital) and a parapharyngeal soft tissue mass originating in an external and medial ear infection. Culture samples revealed Pseudomonas aeruginosa infection leading to the diagnosis of Malignant otitis externa (MOE). Parenteral antibacterial therapy and hyperbaric oxygen therapy resulted in improvement.
Learning points: Malignant otitis externa is an aggressive and life-threatening disease which must be identified early and treated promptly for therapeutic success.Although starting as an outer ear infection (typically caused by Pseudomonas aeruginosa) local spread can involve noble head and neck structures leading to variable signs and symptoms.Modern imaging techniques can help define structure involvement (MRI) and may help identify disease activity and prognosis (nuclear medicine).
Keywords: Malignant otitis externa; internal carotid vasculitis; skull base osteomyelitis; stroke.