Mastoid ecchymosis. Battle's sign of basal skull fracture.
D004438:Ecchymosis / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008416:Mastoid; D008875:Middle Aged; D011859:Radiography; D012877:Skin Manifestations; D012887:Skull Fractures / Q000175:diagnosis* / Q000000981:diagnostic imaging