Pintor-Tortolero, JoseDuran-Martinez, ManuelCalleja-Lozano, Rafael2023-02-082023-02-082019-11-28Pintor Tortolero J, Durán Martinez M, Calleja Lozano R. Anorectal Melanoma as an Unexpected Diagnosis for a Pigmented Mass Resembling a Thrombosed Hemorrhoid. Clin Gastroenterol Hepatol. 2021 Feb;19(2):e12-e13http://hdl.handle.net/10668/14774A 71-year-old woman presented with a sensation of an anal mass, episodes of rectal bleeding, and a 2-kg weight loss over the past year. She had a prior diagnosis of hemorrhoids, which had been managed with warm sitz baths and antihemorrhoidal cream. On rectal examination, a pedunculated, hard mass was identified. Colonoscopy revealed an irregular, ulcerated, blackish, hard, and friable mass located at the confluence of the lower rectum and anal canal. Histological analysis confirmed a malignant intraepithelial proliferation of melanocytes, consistent with anorectal melanoma. Magnetic resonance imaging (MRI) showed a mass at the anorectal junction occupying 50% of the luminal circumference, without evidence of obstruction. The patient underwent a laparoscopic abdominoperineal resection, with a favorable postoperative recovery and discharge on the fifth day.enRectumHemorrhoidsGastrointestinal HemorrhageProctectomyAnus DiseasesColonoscopyMagnetic Resonance ImagingAnal CanalAnus NeoplasmsHemorrhoidsHumansMelanomaRectumresearch article31786326Restricted AccessNeoplasias anorrectalesColonoscopíaResección abdominoperinealHemorragia rectalResonancia magnética por imágenes10.1016/j.cgh.2019.11.0391542-7714http://www.cghjournal.org/article/S1542356519313795/pdf