“…Gastroduodenal intussusception, also known as ball valve syndrome, is an extremely rare event, which occurs when a gastric umor herniates into the duodenum and induces gastric obstruction. Ball valve syndrome is rare, although various etiologies like gastric adenoma, leiomyoma, lipoma, hamartoma inflammatory fibroid polyp, adenocarcinoma, and leiomyosarcoma can cause this pathology [1]. However, gastrointestinal stromal tumors (GISTs) are infrequently reported to cause gastroduodenal intussusception [2,3], especially in the cases with complete pylorus obstruction.…”