Media type: E-Article Title: Ball-Valve Syndrome, an Unusual Presentation of a GIST Contributor: Carvalho, Maria Margarida; Laranjo, Ana Margarida; Rei, Andreia; Gonçalves, Lurdes; Quintana, Carlos; Medeiros, Isabel imprint: S. Karger AG, 2021 Published in: GE - Portuguese Journal of Gastroenterology Language: English DOI: 10.1159/000511808 ISSN: 2387-1954; 2341-4545 Keywords: Gastroenterology ; General Materials Science Origination: Footnote: Access State: Open Access