Esophagus - benign structure, hiatus hernia, achalasia, esopageal varices, infection, neoplasms of the esophagus, mediastinal abnormalities affecting the esophagus; stomach - developmental abnormalities encountered in the adult, gastric neoplasms, malignant neoplasms of the stomach; duodenum and pancreas - congenital malformation, duodenal ulcer disease, neoplasms of the duodenum, miscellaneous disorders of the duodenum, pancreatitis, pancreatic neoplasms, pancreatic calcification; biliary tract - congenital malformations, calculous disease, neoplasms, miscellaneous disorders; small bowel - malabsorption, infestations and infections, enteric infections, intra-abdominal infections affecting the small bowel, neoplasms; colon - examination of the colon, inflammatory disorders, neoplasms of the colon, miscellaneous; generalized disorders - Crohn's disease, haemorrhage and ischemia, scleroderma, neoplasms.