A Broad-Based Submucosal Polyp2021-08-010 OA AI SSteve Qian *MMohamad Mouchli TThomas C. Smyrk DOI:10.1053/j.gastro.2020.12.027OriginalOriginal request for helpShareSaveAbstract En Keywords:Colon polyp Gastrointestinal sarcoma PEComa Perivascular epitheloid cell