Dermoid cyst of the middle ear and mastoid.
D003884:Dermoid Cyst / Q000175:diagnosis*; D004428:Ear Neoplasms / Q000175:diagnosis*; D004432:Ear, Middle / Q000000981:diagnostic imaging / Q000473:pathology; D006801:Humans; D007223:Infant; D008297:Male; D008416:Mastoid / Q000000981:diagnostic imaging / Q000473:pathology; D011859:Radiography; D012888:Skull Neoplasms / Q000175:diagnosis*