Abstract
Fibrous dysplasia is a benign disease characterized by the progressive replacement of normal bone elements with fibrous tissue, and tympanic cavity involvement is uncommon. A 13-year-old female visited our hospital complaining of progressive left hearing loss over 7 years. Computed tomography showed a tumor shadow from the tegmental wall along the short leg of the incus to the middle tympanic cavity. Magnetic resonance imaging revealed low signal intensities on both T1- and T2-weighted images enhanced by gadolinium. The histological examination gave a diagnosis of fibrous dysplasia. The treatment is mainly conservative, although surgery may be required in the future to preserve hearing function and prevent facial nerve complications.
