1. Stomach and duodenum: Differential diagnosis;Levine,2008
2. Dynamic Radiology of the Abdomen: Normal and Pathologic Anatomy;Meyers,2000
3. Bowel gas and fluid;Rennel,1981
4. Massive gastric distension due to duodenal involvement by retroperitoneal tumors;Shammash;Gastrointest Radiol,1992