Halo sign around a parathyroid adenoma.
D000236:Adenoma / Q000175:diagnosis* / Q000000981:diagnostic imaging; D000328:Adult; D000792:Angiography; D006801:Humans; D008297:Male; D010282:Parathyroid Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging; D014463:Ultrasonography