title: Diagnostic value of MRI and computed tomography in anorectal malignant melanoma.
abstract: Here, we report 12 cases of anorectal malignant melanoma (ARMM), which has a very rare incidence. Patients were examined by either computed tomography or MRI or computed tomography combined with MRI before they underwent a remission operation. Because of the paramagnetic contribution from melanin, the short T(1) and short T(2) signals in MRI were specific to melanoma. MRI is reliable in the early diagnosis of ARMM, which is confirmed by pathological reports. Therefore, we advocate the application of a radiological screen using MRI for those patients with a mole in the anorectal region and abnormal colonoscopy findings.
authors.affiliation: Department of Imaging, Tianjin Union Medicine Centre (Nankai University Affiliated Hospital), Tianjin, People's Republic of China.
authors.forename: Peng
authors.initials: P
authors.lastname: Li
authors.forename: Jun
authors.initials: J
authors.lastname: Liu
mesh_terms: D000328:Adult; D000368:Aged; D001005:Anus Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008545:Melanoma / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D008875:Middle Aged; D011237:Predictive Value of Tests; D012004:Rectal Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D014057:Tomography, X-Ray Computed