IDAN UNIVERSITY SHANGHAI CANCER CENTER Gastrointestinalstudies. Cs1.2. gas and barium double contrast ⑨复旦大学上海医学院肿痼学糸FUDAN UNIVERSITY SHANGHAI CANCER CENTER 复旦大学上海医学院肿瘤学系 • 1.2. Gas and barium double contrast Gastrointestinal studies