The appearance of enlarged peritoneal lymph nodes is common in two kinds of diseases: 1. primary in the digestive tract, such as gastric or intestinal malignant tumors appearing as peritoneal lymph node metastases. Clinical manifestations are symptoms of the primary malignant tumor disease, for example, gastric cancer usually manifests as upper abdominal fullness and discomfort, pain, even accompanied by acid reflux and belching, and in severe cases, symptoms such as vomiting blood and black stool can occur. Colon and rectal cancers mainly involve changes in bowel habits and traits, and may be accompanied by complete and incomplete bowel obstruction, or even mucus and blood stools. Metastasis of peritoneal lymph nodes in gastric cancer or colon and rectal cancer usually means advanced disease, and it will also be accompanied by more than medium amount of ascites.2. It is mainly seen in lymphoma, especially central type of retroperitoneal lymph node enlargement, which usually manifests as vague abdominal pain and discomfort, and because it is difficult to take material to confirm the diagnosis, further bone marrow aspiration examination is needed to clarify the diagnosis, and chemotherapy is mainly used.