Colorectal cancer is a common malignant tumor of digestive tract, mainly adenocarcinoma, which can be divided into three types: proliferative type (mass type), ulcerative type and infiltrative type. X-ray air-barium double contrast radiography is one of the main preferred methods.
X-ray examination: early colon cancer means that the diameter of the focus is less than 3cm and is confined to the submucosa. Radiography showed quasi-round filling defect, broken and irregular intestinal parietal line. The manifestations of advanced colon cancer were irregular filling defect in the lumen, interruption of mucous membrane and irregular niches on the surface of the mass. The colon bag disappeared and the wall of the tube was stiff. Soft tissue mass can be seen in air-barium phase. Ulcer type: large irregular niches in the cavity, irregular edges, sharp corners, interruption of mucous membrane, rigidity of intestinal wall and disappearance of colon. Infiltrative type: the intestinal canal of the diseased part is narrow, often partial to one side, the intestinal wall is stiff, irregular nodular shadow can be seen on the mucous membrane, the severe lesion invades the whole week, and the lumen is obviously narrow, causing intestinal obstruction.
