Mastoid osteomas: report of two cases.

OBJECTIVE: To discuss the differential diagnosis of two cases with mastoid mass. STUDY DESIGN: Case report and review of the literature. SETTING: The study was carried out in Gulhane Military Medical Academy, Haydarpasa Training Hospital, Istanbul, Turkey. PATIENT, INTERVENTION, AND RESULTS: Both cases were 23-year-old males. They admitted to our clinic with masses behind their left ears that had been progressively enlarging for 5 years. In both cases, coronal and axial computerized tomography scans revealed a wide-based lesion involving temporal bone cortex. The cases were operated on for diagnosis and for correction of the cosmetic deformity. Histopathological examinations were consistent with mixed and spongiotic osteoma. CONCLUSIONS: Mastoid osteoma is a rare, benign tumor of bone. It may cause cosmetic deformity such as external mass or an auricular protrusion. Other neoplasms of the mastoid region, such as osteosarcoma and osteoblastic metastasis, should be considered for the differential diagnosis.