Occupancy in the tail of the pancreas means that there is a tumor or mass found in the tail of the pancreas that is outside the normal anatomical structure, and a bad occupancy indicates that the mass may be malignant. Occupation in the tail of the pancreas refers to tumors or masses found in the tail of the pancreas other than the normal structures in the imaging examinations such as ultrasound or CT etc. There are many reasons for occupying the pancreas, and the common ones are inflammatory lesions such as acute pancreatitis, cystic lesions of the pancreas such as pancreatic pseudocysts, and tumors such as cystic adenomas and pancreatic cancer etc. Generally, benign occupying lesions have a morphology that is not normal. Generally, benign space-occupying lesions have regular morphology, smooth edges and clear borders. Malignant space-occupying lesions have irregular morphology, unclear borders, and even burrs can appear around them. It is often said that the occupying space is not good, and it is thought that there may be malignant tumors, such as pancreatic cancer, pancreatic sarcoma and so on. It is recommended to improve the examination in time and standardize the treatment under the guidance of the doctor.