title: Primary anorectal melanoma on FDG PET/CT.
abstract: Primary anorectal melanoma is an extremely rare, aggressive malignancy with a poor prognosis. A 76-year-old man with a 2-month history of rectal bleeding, anal pain, and tenesmus was referred for an F-FDG PET/CT examination, which revealed an abnormal focal FDG uptake on the lower rectum with multiple other intense FDG-avid regions in locoregional pelvic lymph nodes, bones, liver, and lung. It was highly suggestive of malignancy, and a provisional diagnosis of advanced rectal carcinoma was made. However, a following tissue biopsy of the lesion on the lower rectum performed by colonoscopy histopathologically indicated primary anorectal melanoma.
authors: From the *PET-CT Center, and †Department of Pathology, Pingjin Hospital, Logistics University of Chinese People's Armed Police Force, Tianjin, People's Republic of China.
authors: Zu-Gui
authors: ZG
authors: Li
authors: Xiao-Jing
authors: XJ
authors: Qin
mesh_terms: D000368:Aged; D002277:Carcinoma / Q000000981:diagnostic imaging* / Q000473:pathology; D019788:Fluorodeoxyglucose F18; D006801:Humans; D008297:Male; D008545:Melanoma / Q000000981:diagnostic imaging / Q000473:pathology; D064847:Multimodal Imaging; D049268:Positron-Emission Tomography; D019275:Radiopharmaceuticals; D012004:Rectal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D014057:Tomography, X-Ray Computed
chemical_list: D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18