A Case of Giant Osteoma Developed from the Mastoid Cortical Bone
A 42-year-old woman visited out-patient clinic complaining of right retroauricular mass. The lesion of the right mastoid area developing over a 20-year period showed a severe cosmetic deformity (). On physical examination, both tympanic membranes were intact and huge, firm, painless, mass-like lesion was found on the right retroauricular area. Temporal bone computed tomography scan (TBCT) demonstrated 2.3×2.3×4.3 cm sized bony mass with a wide base on the surface of the mastoid cortical bone and squama without abnormalities of the middle and inner ear structures ().\nThe resection of tumor was performed using retroauricular approach (). The mass was widely exposed after elevation of mastoid periosteal flap and the margin of the mass was drilled down until the normal air cells were encountered. The mass attached to the lower part of the squama was drilled out. Remaining main mass was totally removed and the defect of mastoid area was reinforced by covering with the titanium mesh. The final histopathologic examination confirmed the osteoma with a compact subtype (). Four months after surgery, the surgical wound was intact, and the evidence of complication or recurrence was not found.