title: Laparoscopic resection of schwannoma of the ascending colon.
abstract: Schwannomas of the colon are rare and difficult to diagnose preoperatively. We report a case of schwannoma of the ascending colon that was resected laparoscopically. A 64-year-old woman was referred to our hospital by her local clinic for further evaluation and management of a submucosal tumor of the ascending colon. A definitive preoperative diagnosis could not be reached despite examinations. Gastrointestinal stromal tumor, leiomyoma and lymphoma were the differential diagnoses. We performed a laparoscopic right hemicolectomy with D2 lymph node dissection. Histological findings with hematoxylin-eosin staining revealed spindle-like tumor cells, and immunohistochemical analysis showed that the tumor was positive for S-100 but negative for c-kit, CD34, smooth muscle actin and desmin, with a Ki-67 index of <5%. Thus, the diagnosis in this case was benign schwannoma of the ascending colon.
authors.affiliation: Department of Surgery, Koshigaya Municipal Hospital, Koshigaya, Japan.
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Tashiro
authors.affiliation: Department of Surgery, Koshigaya Municipal Hospital, Koshigaya, Japan.
authors.forename: Fumio
authors.initials: F
authors.lastname: Matsumoto
authors.affiliation: Department of Surgery, Koshigaya Municipal Hospital, Koshigaya, Japan.
authors.forename: Keiko
authors.initials: K
authors.lastname: Iwama
authors.affiliation: Department of Surgery, Koshigaya Municipal Hospital, Koshigaya, Japan.
authors.forename: Ai
authors.initials: A
authors.lastname: Shimazu
authors.affiliation: Department of Surgery, Koshigaya Municipal Hospital, Koshigaya, Japan.
authors.forename: Sei
authors.initials: S
authors.lastname: Matsumori
authors.affiliation: Department of Surgery, Koshigaya Municipal Hospital, Koshigaya, Japan.
authors.forename: Shigeo
authors.initials: S
authors.lastname: Nohara
authors.affiliation: Department of Surgery, Koshigaya Municipal Hospital, Koshigaya, Japan.
authors.forename: Hiroyoshi
authors.initials: H
authors.lastname: Miura
authors.affiliation: Department of Surgery, Koshigaya Municipal Hospital, Koshigaya, Japan.
authors.forename: Masahiko
authors.initials: M
authors.lastname: Takei
authors.affiliation: Department of Surgery, Koshigaya Municipal Hospital, Koshigaya, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Namekata
authors.affiliation: Department of Pathology, Koshigaya Municipal Hospital, Koshigaya, Japan.
authors.forename: Masaru
authors.initials: M
authors.lastname: Takase
authors.affiliation: Department of Pathology, Koshigaya Municipal Hospital, Koshigaya, Japan.
authors.forename: Motoi
authors.initials: M
authors.lastname: Okada
authors.affiliation: Department of Surgery, Koshigaya Municipal Hospital, Koshigaya, Japan.
authors.forename: Hidenori
authors.initials: H
authors.lastname: Tsumura
keywords: Laparoscopic surgery; Schwannoma