title: Subperitoneal adenomucinosis following proctocolectomy for ulcerative colitis.
abstract: Adenomucinosis is a rare condition characterized by accumulation of large volumes of mucin, typically related to mucinous neoplasms of the appendix within the peritoneal space. Extraperitoneal adenomucinosis is an uncommon variant where mucin accumulates outside the peritoneal space and usually arises following surgery for mucinous appendiceal neoplasms. This is a case of subperitoneal adenomucinosis resulting from retention of a small fragment of rectal mucosa following proctocolectomy for ulcerative colitis 16 years prior. The patient presented with a slow-growing boggy perineal mass. Contrast-enhanced magnetic resonance imaging (MRI) showed the mass to be localized to the pelvis, without solid enhancing components, and correctly facilitated local surgical excision without the risk of peritoneal dissemination and accurately predicted benignity.
authors.affiliation: Division of Abdominal Imaging, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania 15213, USA. ryaner@upmc.edu
authors.forename: E Ronan
authors.initials: ER
authors.lastname: Ryan
authors.forename: Keyanoosh
authors.initials: K
authors.lastname: Hosseinzadeh
authors.forename: Mona
authors.initials: M
authors.lastname: Bansal
authors.forename: Wolfgang H
authors.initials: WH
authors.lastname: Schraut
mesh_terms: D002288:Adenocarcinoma, Mucinous / Q000209:etiology*; D003093:Colitis, Ulcerative / Q000175:diagnosis* / Q000601:surgery*; D003287:Contrast Media / Q000494:pharmacology; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008875:Middle Aged; D010502:Perineum / Q000473:pathology; D010537:Peritoneum / Q000473:pathology; D012306:Risk
chemical_list: D003287:Contrast Media