Mastoid osteoma: Report of a case and literature review

Mastoid osteoma is a benign osteogenic tumor with few reported cases in the literature. The exact cause is unknown; however, developmental anomaly, trauma, and infection have been implicated. Majority are asymptomatic, and diagnosis can be made with computed tomography scan. Surgical excision is curative and offers acceptable cosmetic results. We aimed to report a case of mastoid osteoma coexisting with subgaleal lipoma and outline its management. A 35-year-old woman presented with left mastoid and frontal swellings because of unacceptable disfigurement. Clinical and radiological evaluation was suggestive of mastoid osteoma and sublingual lipoma. The diagnosis was confirmed by histology, after total surgical excision. The patient made uneventful recovery and had acceptable curative and esthetic results. Mastoid osteoma can occur alone or in association with other lesions such as lipoma, especially in syndromic type. In general, asymptomatic and cranial computed tomography scan remained an imaging of choice and surgical resection confers good outcome.