Breast sarcomas are less common malignant tumors, including mesenchymal sarcomas of mesodermal connective tissue origin, fibrosarcomas, angiosarcomas and lymphosarcomas. There is another kind of tumor different from the general sarcoma, is composed of benign epithelial components and cell-rich mesenchymal components of Chu Yanqui, because of its individual specimens often appear fissures and called lobulated tumors, according to its mesenchymal components, the degree of cell differentiation can be divided into benign and malignant. Benign ones are called lobulated fibroadenomas; malignant ones are called lobulated cystic sarcomas, in which the epithelial component may show benign hyperplasia, while the mesenchymal component has obvious nuclear division and anisotropy. It is common in women over 50 years of age and presents as a breast lump, which can be large in size but with distinct boundaries and dilated veins visible on the skin surface. The lump is usually pushable without adhesion to the skin, except when it invades the pectoral muscle, where it is more fixed. Axillary lymph node metastases are rare, while lung, mediastinal and bone metastases are predominant. Mastectomy alone is sufficient for treatment, but if there is pectoral fascia invasion, it should also be removed. The effect of radiotherapy or chemotherapy is difficult to evaluate.