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November 1989

Radiological Case of the Month

Am J Dis Child. 1989;143(11):1351-1352. doi:10.1001/archpedi.1989.02150230109036

A 15-year-old girl was admitted for evaluation of fullness of her left ear. Her physician had made a diagnosis of left external otitis. The physical examination results were normal except for an extremely narrowed left external auditory canal. The narrow lumen was engulfed by bony overgrowth, and no local edema or signs of inflammation were seen. Audiologic evaluation demonstrated a moderate conductive hearing loss. A computed tomographic scan of the region was performed (Figure).

Denouement and Discussion 

Monostotic Fibrous Dysplasia of the Temporal Bone  Computed tomographic scan demonstrating narrowing of the left external auditory canal caused by an expansile bone lesion of the temporal bone (curved arrow). The regional bone was characterized by a "ground-glass" appearance. A small cholesteatoma is located between the tympanic membrane and the bony lesion (black arrow).The patient underwent surgical exploration of the ear. The nearly obliterated lumen was widened, and the canal was cleaned

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