title: Simultaneous gastric adenocarcinoma and gastrointestinal stromal tumor of the stomach: a case report.
abstract: Simultaneous a collision tumor of stomach consisting of adenocarcinoma and Gastrointestinal Stromal Tumor (GIST) is very rare based on our knowledge. This coexistence has rarely been reported in literatures. We report a case of 64-year-old woman who has diagnosed with prepyloric poorly-differentiated diffuse signet-ring cell type adenocarcinoma and has undergone an elective D2 total gastrectomy. During operation another mass in fundic body region has found. The pathologic examination of the mass has shown GIST. Immunohistochemical staining for CD117 and Desmin was positive whilst that for S100 was negative. This case reports the simultaneous two tumors development of different histotypes and natures in the same organ.
authors.affiliation: Dept. of General and Vascular Surgery, Shahid Beheshti University of Medical Sciences, Tehran, Iran ; Cancer Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Jalaluddin
authors.initials: J
authors.lastname: Khoshnevis
authors.affiliation: Cancer Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Azadeh
authors.initials: A
authors.lastname: Rakhshan
authors.affiliation: Dept. of General and Vascular Surgery, Shahid Beheshti University of Medical Sciences, Tehran, Iran ; Cancer Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Sobhiyeh
authors.affiliation: Dept. of General and Vascular Surgery, Shahid Beheshti University of Medical Sciences, Tehran, Iran ; Cancer Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Barmak
authors.initials: B
authors.lastname: Gholizadeh
authors.affiliation: Cancer Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Rahbari
authors.affiliation: Dept. of General and Vascular Surgery, Shahid Beheshti University of Medical Sciences, Tehran, Iran ; Cancer Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Farideh
authors.initials: F
authors.lastname: Adhami
authors.affiliation: Cancer Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Saran
authors.initials: S
authors.lastname: Lotfollahzadeh
keywords: Adenocarcinoma; Gastrointestinal stromal tumor; Stomach cancer