title: [A case of rectal schwannoma presenting with hematochezia].
abstract: Rectal schwannoma is a rare mesenchymal tumor originating from Schwann's cell. We experienced a 61- year-old female patient who complained of blood tinged and narrow calibered stool for several years, and found a 4 cm sized submucosal tumor with a central ulcer on the rectal wall during colonoscopy. She underwent transanal excision. Microscopically, the tumor was composed of fasciculating bundles of spindle cells with benign nuclear atypia and peripheral lymphoid cell cuffing. Tumor cells showed a diffuse strong immunoreactivity to S-100 protein, but not stain for CD 34, desmin and smooth muscle actin. This is the first case report of rectal schwannoma in Korea.
authors.affiliation: Department of Internal Medicine, Pusan National University College of Medicine, Seo-gu, Busan, Korea.
authors.forename: Seong Hun
authors.initials: SH
authors.lastname: Lee
authors.forename: Tae Oh
authors.initials: TO
authors.lastname: Kim
authors.forename: Sang Youn
authors.initials: SY
authors.lastname: Hwang
authors.forename: Dong Yup
authors.initials: DY
authors.lastname: Ryu
authors.forename: Dong Hyun
authors.initials: DH
authors.lastname: Lee
authors.forename: Won Il
authors.initials: WI
authors.lastname: Park
authors.forename: Gwang Ha
authors.initials: GH
authors.lastname: Kim
authors.forename: Jeong
authors.initials: J
authors.lastname: Heo
authors.forename: Dae Hwan
authors.initials: DH
authors.lastname: Kang
authors.forename: Geun Am
authors.initials: GA
authors.lastname: Song
authors.forename: Mong
authors.initials: M
authors.lastname: Cho
mesh_terms: D014408:Biomarkers, Tumor / Q000032:analysis; D003113:Colonoscopy; D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis*; D006801:Humans; D008875:Middle Aged; D009442:Neurilemmoma / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D012004:Rectal Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D012007:Rectum; D014057:Tomography, X-Ray Computed
chemical_list: D014408:Biomarkers, Tumor