Tumor invasion of peripancreatic adipose tissue means that the tumor invades the surrounding adipose tissue, suggesting local progression, and it is recommended to go to the hospital for standardized treatment in time. Pancreatic cancer is a malignant tumor of the digestive tract with insidious onset, rapid progression, and extremely poor therapeutic effect and prognosis. Most of the patients are already in the middle or late stage when they are diagnosed. Middle or late stage patients often have obvious clinical symptoms and complications, such as epigastric pain, jaundice, gastrointestinal symptoms (such as loss of appetite, nausea, vomiting, abdominal distension, dyspepsia, etc.), emaciation, and malignant morbidity. Pancreatic cancer usually shows infiltrative growth, and if progression occurs, it may invade the peripancreatic adipose tissue and may further infiltrate into the surrounding tissues, such as invading the celiac trunk, superior mesenteric artery and/or common hepatic artery. If it invades the peripancreatic adipose tissue, it is at least stage T3. If the tumor invades the peripancreatic adipose tissue, it is recommended to go to the hospital in time for clear diagnosis and treatment.