CT of the abdomen can detect the disease appendicitis. Due to secondary infection and obstruction of the appendix, dense changes of fecal stones in the lumen of the appendiceal duct can be detected under the imaging changes of CT. The wall of the appendiceal duct is significantly thickened, and when the wall thickening is greater than 6 mm, it has obvious pathological significance. Appendiceal suppuration may also present with changes of fluid exudate around the lumen of the appendiceal duct, and significant changes of the greater omentum encapsulation may be found in patients with periappendiceal abscesses. Enlargement of regional lymph nodes in the iliac fossa can also be found, which is a reactive hyperplasia of the lymph nodes due to the local inflammatory response. Patients with appendicitis may also present with paralytic intestinal obstruction due to the spread of symptoms of infection to the adjacent intestinal canal, with dilated intestinal canal and the presence of fluid and gas planes detected on ultrasound or CT imaging.