title: Gastric schwannoma diagnosed by endoscopic ultrasonography-guided trucut biopsy.
abstract: Schwannomas of the gastrointestinal (GI) tract are rare subepithelial tumors comprising approximately 3.3% to 12.8% of all mesenchymal tumors of the GI tract. On endoscopic ultrasound (EUS) they are seen as hypoechoic tumors arising most commonly from the 4th proper muscle layer. Although EUS helps to distinguish tumor characteristics, tissue sampling is required for differentiation with other more common tumors such as GI stromal tumors. Both EUS-guided fine needle aspiration and EUS-guided trucut biopsy (EUS-TCB) can be used for tissue sampling. However, only EUS-TCB allows core biopsy and a high yield of immunohistochemical staining. We report a case of a gastric schwannoma diagnosed by EUS-TCB.
authors.affiliation: Institute for Digestive Research, Digestive Disease Center, Soonchunhyang University Hospital, Soonchunhyang University College of Medicine, Seoul, Korea.
authors.forename: Sung Wook
authors.initials: SW
authors.lastname: Hong
authors.forename: Won Young
authors.initials: WY
authors.lastname: Cho
authors.forename: Jin-Oh
authors.initials: JO
authors.lastname: Kim
authors.forename: Chang Gyun
authors.initials: CG
authors.lastname: Chun
authors.forename: Kwang Yeun
authors.initials: KY
authors.lastname: Shim
authors.forename: Gene Hyun
authors.initials: GH
authors.lastname: Bok
authors.forename: Wook Hyun
authors.initials: WH
authors.lastname: Um
authors.forename: Ji Eun
authors.initials: JE
authors.lastname: Lee
keywords: Endoscopic ultrasonography-guided trucut biopsy; Gastric schwannoma