title: A case of kaposiform hemangioendothelioma at the sigmoid colon.
abstract: We report a case of kaposiform hemangioendothelioma (KHE) occurring at the sigmoid colon in an 8-year-old male. He had experienced lower abdominal pain and fever for several days. Contrast-enhanced CT images revealed a well-enhanced mass involving several large and small cystic parts with thin, enhanced walls at the sigmoid colon. The diagnosis was made histopathologically after surgical resection; the cystic parts corresponded to dilated lymphatic vessels. KHE is a rare, locally aggressive, vascular tumor that usually occurs in the soft tissues of the extremities. However, a case occurring in the bowel is extremely rare, and usually appears as bowel wall thickening. This is a unique case of KHE appearing as a mass-shaped hypervascular lesion in the bowel. Dilated lymphatic vessels in KHE may appear as a cystic part of the lesion.
authors.affiliation: Department of Radiology, Nihon University of Medicine, 30-1, Ohyaguchi Kami-cho, Itabashi-ku, Tokyo, 173-8610, Japan, karate.b@gmail.com.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Haradome
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Toda
authors.forename: Tsugumichi
authors.initials: T
authors.lastname: Koshinaga
authors.forename: Masahiko
authors.initials: M
authors.lastname: Sugitani
authors.forename: Osamu
authors.initials: O
authors.lastname: Abe
mesh_terms: D002648:Child; D003082:Colectomy; D003287:Contrast Media; D006390:Hemangioendothelioma / Q000175:diagnosis* / Q000601:surgery; D006801:Humans; D059885:Kasabach-Merritt Syndrome / Q000175:diagnosis* / Q000601:surgery; D008297:Male; D012514:Sarcoma, Kaposi / Q000175:diagnosis* / Q000601:surgery; D012811:Sigmoid Neoplasms / Q000000981:diagnostic imaging* / Q000601:surgery; D014057:Tomography, X-Ray Computed / Q000379:methods; D016896:Treatment Outcome
chemical_list: D003287:Contrast Media