Primary gastric synovial sarcoma resected by laparoscopic endoscopic cooperative surgery of the stomach: a case report. - Shibata R; Morishita M; Koreeda N; Hirano Y; Kaida H; Ohmiya T; Uwatoko S; Kawamoto M; Komono A; Sakamoto R; Miyasaka Y; Higashi D; et al. (Surgical case reports, 2021)