The malignant features of pancreatic caudal tumors on imaging are unclear borders, abundant blood flow signals, and large size. Pancreatic cancer is a malignant tumor of the digestive tract with insidious onset, rapid progression, and extremely poor therapeutic outcome and prognosis. Diagnosis of pancreatic cancer requires a combination of symptoms, serum tumor markers, imaging and pathology. 1. Unclear border. Most malignant tumors have unclear edges, such as “burr” manifestation. 2. rich blood flow signal, CT can show significant enhancement, and color Doppler ultrasound can see obvious blood flow signal. 3. Rapid volume growth, peripheral infiltration, metastatic manifestations. Malignant tumors usually grow rapidly, show infiltrative growth and may show lymph node metastasis and distant metastasis. If pancreatic cancer is suspected or diagnosed, it is recommended to go to a regular hospital for comprehensive evaluation of the condition and follow the doctor’s instructions to avoid delaying the condition.