Parasplenomegaly is a physiological change formed by abnormal development of the spleen, which is more likely to occur at a younger age and generally does not require special treatment. Parasplenium can usually be recognized by its mechanism of occurrence, location and symptoms, and if the body shows abnormal manifestations due to parasplenium, it should be promptly examined by a doctor and treated accordingly. 1. Mechanism of occurrence: Parasplenium is an organ that is structurally and functionally similar to the normal spleen formed when one or several mesenchymal cell clusters cannot fuse the spleen. 2. location: the splenic hilum is the most common location, but it can also appear in the splenic hilum, the greater omentum, or metastasize distally to the mesentery and ovaries; 3. symptoms: most are asymptomatic. Parasplenium also has the possibility of rupture, hemorrhage, hyperplasia, infarction and other abnormal lesions, which manifest as headache, weakness, jaundice, splenomegaly, fever and other symptoms of hemolytic anemia. When the parasplenium proliferates, ruptures, or bleeds, it may cause symptoms of decreased blood volume such as vague epigastric pain, fine and rapid pulse rate, and dizziness. When parasplenium is embolized or infarcted, it manifests as severe epigastric pain that may radiate to the left shoulder, or accompanied by nausea and vomiting. 4. Examination: Parasplenium is usually found incidentally during ultrasonography or surgery for other abdominal organ diseases. CT examination shows round or ovoid nodules, similar to lymph nodes. MRI can help to distinguish parasplenium from other abdominal masses. 5. Treatment: Asymptomatic parasplenium usually does not require treatment, but in case of complications such as intestinal obstruction or bleeding from ruptured spleen, it should be treated by surgical excision. In addition, since the blood supply of the parasplenium originates from the splenic artery, it needs to be removed along with the spleen if hematologic disorders cause hypersplenism; in other cases, the parasplenium can usually be preserved to perform spleen functions instead of the spleen.