Tumors of the tail of the pancreas can generally show the following lesions, which are analyzed as follows: First, plasmacytic cystic adenoma, also known as microcystic adenoma or glycogen-rich adenoma, is a relatively rare benign tumor of the pancreas. It often occurs in the tail of the pancreatic body and is more common in the elderly. Secondly, mucinous cystic tumors, which can be classified as benign, junctional or malignant, are mostly found in women, with an age of onset of 40-60 years. It is usually found in the tail of the pancreatic body and is often a large multicystic or occasionally single cystic mass with a tumor diameter of 2-30 cm. Third, malignant tumors can also occur in the tail of the pancreas, such as pancreatic cancer. Usually the lesions are relatively insidious and often easy to be overlooked. Therefore, it is recommended that patients must have regular health checkups to avoid delaying the disease.