title: Doughnut sign in subdural hematomas.
mesh_terms: D001921:Brain; D002339:Carotid Arteries / Q000000981:diagnostic imaging; D002533:Cerebral Angiography; D014695:Cerebral Ventriculography; D002648:Child; D005260:Female; D006408:Hematoma, Subdural / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D006849:Hydrocephalus / Q000151:congenital; D008297:Male; D011877:Radionuclide Imaging; D013667:Technetium
chemical_list: D013667:Technetium