Tumors of lower abdomen

? It mainly includes abdominal wall tumor, gastric cancer, large intestine cancer, small intestine tumor, liver cancer, biliary tumor, pancreatic tumor, spleen tumor, peritoneal and retroperitoneal tumor, gastrointestinal and neuroendocrine system tumor, etc. Benign abdominal wall tumor includes desmoid tumor, fibroma, neurofibroma, hemangioma, papilloma, dermoid cyst, etc. Malignant tumor includes fibrosarcoma, dermatofibrosarcoma protuberans, melanoma, skin cancer and metastatic cancer, etc. Clinically, it presents as a painless oval mass in the peritoneum, hard and slow growing. It can be found in most patients when the tumor reaches a few centimeters in diameter. When the abdominal muscles contract, the outline of the tumor can still be clearly touched, which can be distinguished from the abdominal tumor. A small number of delayed patients, tumor to the surrounding patchy invasive growth, large abdominal wall stiffness diameter up to ten centimeters, tumor mostly from rectus abdominis, abdominal external oblique muscle, abdominal oblique muscle or transverse abdominal muscle sheath, or aponeurosis to muscle invasive growth, tumor without capsule, irregular edge, crab foot shape, tough texture, like rubber, interface gray white, interlaced woven shape.