Dilatation of the small intestine is an important manifestation of malabsorption syndrome, mostly in the jejunum, especially in the lower and middle part of the jejunum, and can sometimes cause dilatation of the entire small intestine, including the duodenum. The degree of small bowel dilatation is related to the severity of the disease, and the cause of dilatation is low tone of the small intestine. It is believed that a small bowel diameter greater than 31 mm can be considered dilated, and the bowel diameter can be two to three times the normal size when it is significantly dilated. Inflation of the small intestine can be mild or severe, while most of the colonic inflations are more significant, often manifesting as peri-abdominal inflation of the whole colonic frame. The distribution of small intestine inflation is mostly in the middle abdomen within the colonic frame, and when the dilatation is severe, the intestinal loops are in the form of continuous tubes; when the dilatation is mild, it appears as separated inflatable intestinal tubes. The tests required for small intestine dilatation and inflation: 1. Oral small intestine angiography The small intestine angiography is performed by X-ray examination. The oral method is a simple and easy method of small intestine imaging. Perform contrast examination of small intestine by X-ray examination. The oral method is a simple and easy way to perform small bowel imaging. The advantages of the oral method are that it is simple, easy to perform, and can be examined by compression method to check the mobility of the small intestine and determine whether there are adhesions; it can observe the function of the small intestine and observe whether there are abnormalities in the position of the small intestine, etc. However, the examination is time-consuming and the intestinal collaterals overlap each other, which hinders the observation of lesions; it cannot eliminate the influence of functional factors; it is not conducive to the discovery of small lesions, and it is even more impossible to find microscopic lesions. 2, small intestine filling and emptying function examination Small intestine filling and emptying function examination can be done by intestinal ultrasound, which can show changes in filling and emptying of the intestinal lumen. It can show the changes of filling and emptying in the lumen of the intestine. The small intestine tube wall is linear hypoechoic, and the intestinal tube diameter is larger than 3.0 cm when it is filled, which is abnormal, and the emptying is stagnant.