title: Gastrointestinal stromal tumor of the lesser omentum in a young adult patient with a history of hepatoblastoma: report of a case.
abstract: A gastrointestinal stromal tumor (GIST) of the lesser omentum is extremely rare. This report presents a case of GIST of the lesser omentum in a 22-year-old man with a history of hepatoblastoma. Computed tomography showed an abdominal mass about 30 mm in diameter adjacent to the lesser wall of the stomach. A laparotomy showed a mass of about 27 x 24 x 20 mm in diameter originating from the lesser omentum but isolated from the stomach and the liver. Histopathology showed that the tumor was composed of spindle-shaped tumor cells with high cellularity. Immunohistochemically, the tumor was positive for KIT and CD34. An in-frame deletion was observed in the c-kit gene exon 11. Therefore, the tumor was diagnosed as a GIST originating from the lesser omentum.
authors.affiliation: Department of General Surgical Science (Surgery I), Graduate School of Medicine, Gunma University, 3-39-22 Showamachi, Maebashi, Gunma 371-8511, Japan.
authors.forename: Ryuusuke
authors.initials: R
authors.lastname: Aihara
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Ohno
authors.forename: Erito
authors.initials: E
authors.lastname: Mochiki
authors.forename: Kana
authors.initials: K
authors.lastname: Saito
authors.forename: Shinji
authors.initials: S
authors.lastname: Sakurai
authors.forename: Atsushi
authors.initials: A
authors.lastname: Takahashi
authors.forename: Takayuki
authors.initials: T
authors.lastname: Asao
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kuwano