由中胚层发生的软组织肉瘤,以纤维肉瘤,脂肪肉瘤,横纹肌肉瘤、平滑肌肉瘤,滑膜肉瘤、神经纤维肉瘤等较常见,有些不能分类的未分化肉瘤常以细胞形态命名,如梭形细胞肉瘤、圆形细胞肉瘤等,有些软组织肉瘤组织来源不明的如巢状软组织肉瘤等。软组织肉瘤临床上比癌少见,约占全部 Mesenchymal soft tissue sarcoma, fibrosarcoma, liposarcoma, rhabdomyosarcoma, leiomyosarcoma, synovial sarcoma, nerve fibrosarcoma, etc. are more common, and some unclassifiable undifferentiated sarcomas are often named after cell morphology, such as spindle cell sarcoma. , rounded cell sarcoma, and some soft tissue sarcoma tissue from unknown sources such as nested soft tissue sarcoma. Soft tissue sarcoma is rarer than cancer in clinical practice, accounting for approximately