Abdominal radiographs are important for the diagnosis of this disease. In the early stage, the main manifestation is paralytic intestinal obstruction: the small intestine is disorganized, the inflation is obvious, and multiple fluid levels are seen in the intestinal lumen in a stepped pattern. If the disease progresses and the intestinal gas enters the intestinal wall, cyst-like pneumatization of the intestinal wall appears. In the more severe cases, the portal vein is inflated because the intestinal gas enters the portal vein: the liver can be seen as a strip or dendritic translucent shadow from the hepatic portal to the liver along the portal vein, and in severe cases, the intestinal collaterals are fixed (intestinal necrosis), pneumoperitoneum (intestinal perforation), and peritoneal fluid (peritonitis). Cystic pneumatosis of the intestinal wall and portal vein inflation signs are the characteristic manifestations of the disease. In severe cases, severe infection, metabolic and/or respiratory acidosis, platelet and neutropenia, and DIC are often associated with the disease, so blood gas analysis, fecal occult blood and culture, routine blood and culture, and DIC screening and confirmatory laboratories are important in determining the disease. The diagnosis can be confirmed if the following three items are present at the same time: 1. Systemic signs of toxicity: unstable body temperature, pallor, irregular breathing and bradycardia, etc. 2. Gastrointestinal manifestations: gastric retention, vomiting, bloody stools, abdominal distention and loss of bowel sounds. 3, abdominal X-ray manifestations: intestinal obstruction and pneumatization of the intestinal wall.