Abdominal CT examination can detect more lesions, including malformation, inflammation, and neoplastic lesions, and usually the types of diseases are as follows: 1. congenital malformation lesions: for example, a few patients may have abdominal visceral transposition, which can be clearly detected from CT; 2. inflammatory diseases: for example, appendicitis, cholecystitis, intestinal obstruction, and even gastrointestinal perforation in the abdomen; 3. occupying lesions: the most important for CT examination purpose, such as occupying lesions of liver, through abdominal CT, especially enhanced CT, the performance of contrast in and out, such as early enhancement of tumor, late venous phase is fading, or enhanced performance, to determine the benign and malignant of tumor, whether it is hepatocellular carcinoma or hepatic hemangioma, etc. The diagnosis of gallbladder occupancy, pancreatic head cancer of pancreas, spleen occupancy and kidney cancer can be achieved by CT. 4.