Osteosarcoma
Lei osteosarcoma occurs in the 40 to 60 years of age and occurs in the extremities. It usually has a long course of disease. It is easy to relapse after local resection. Pediatric soft tissue leiomyosarcoma has low malignancy and good prognosis. According to the location of the occurrence, it is divided into three types: ① skin, subcutaneous type ② retroperitoneal, mesenteric type ③ vascular type.
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