Malignant phylloid breast tumor

Introduction. A phylloid tumor, also known as a leaf-shaped or intracanalicular fibroadenoma with a cellular stroma is a rare pathology that accounts for 0.3-0.5 % of all breast neoplasms. A phylloid tumor is characterized by the potential for transformation into a breast sarcoma due to malignant changes in the stroma. Breast sarcoma is a rare non-epithelial malignant tumor that occurs in 1 % of cases of the total number of malignant breast tumors and 5% of all soft tissue sarcomas. Primary breast sarcomas are rare and histologically heterogeneous malignant neoplasms, publications on this topic are limited. Description of the clinical case. The article presents a clinical observation of a patient with a malignant phylloid breast tumor who underwent surgical treatment in the volume of a radical mastectomy according to Madden. Discussion. The clinical case is interesting for the rare type of fibroepithelial tumor and the difficulty of final verification of histogenesis at the preoperative stage due to the difficulty of differentiating malignant leaf-shaped tumor from metaplastic carcinoma. Conclusions. Specialists will have to conduct a considerable number of histochemical and genetic studies of a large number of cases of malignant phylloid breast tumors to develop an effective algorithm for the treatment of this pathology.