Osteoma of the mastoid.
We present herein a rare case of osteoma mixtum of the mastoid. The main features of the osteoma were demonstrated clearly by preoperative tangential X-ray projection. Histological studies revealed the osteoma to be composed of multiple small foci of ossification on the outer layer with a large single inner mass. Subsequent examinations revealed that the osteoma had arisen from the parietosquamosal suture.
D000328:Adult; D005260:Female; D006801:Humans; D008416:Mastoid / Q000000981:diagnostic imaging* / Q000473:pathology; D010016:Osteoma / Q000000981:diagnostic imaging* / Q000473:pathology; D011859:Radiography