title: An unusual osteolytic lesion of the skull due to a traumatic arachnoid cyst.
mesh_terms: D000328:Adult; D001099:Arachnoid / Q000601:surgery*; D001847:Bone Diseases / Q000000981:diagnostic imaging / Q000209:etiology* / Q000601:surgery; D001927:Brain Diseases / Q000150:complications* / Q000000981:diagnostic imaging / Q000601:surgery; D006259:Craniocerebral Trauma / Q000150:complications*; D003560:Cysts / Q000150:complications* / Q000000981:diagnostic imaging / Q000601:surgery; D004388:Dura Mater / Q000293:injuries; D006801:Humans; D008297:Male; D009777:Occipital Bone; D011859:Radiography