Two Cases of Extragastrointestinal Stromal Tumor in the Lesser Omentum Resected by Laparoscopic Surgery

Abstract

Case 1 : The patient was a 75-year-old woman who was referred for a suspected gastric tumor found on abdominal ultrasonography. Upper gastrointestinal endoscopy failed to detect any tumor, and computed tomography (CT) and endoscopic ultrasound showed a 30-mm extramural growth-type tumor on the posterior wall of the middle of the gastric body. The patient underwent laparoscopic resection. Intraoperative findings showed that there was no continuity with the gastric wall. The pathological diagnosis was extra-GIST derived from the lesser omentum. Case 2 : A 73-year-old man was referred for surgery because he was found to have sigmoid colon cancer on colonoscopy. Preoperative CT showed an incidental finding of an extramural protruding tumor on the posterior wall of the gastric fundus. Endoscopic ultrasound-guided fine needle aspiration (EUS-FNA) was performed, and GIST was diagnosed. Laparoscopic resection was performed for the GIST with the sigmoid colon cancer. The tumor could be completely removed without damage to the stomach. Laparoscopic surgery was considered useful in the resection of the extra-GIST without damage to other organs.