A review of mammary phyllodes tumors is presented. Clinical, radiological and cytological features are treated, with special emphasis on the histopathological grading system and prognostic indicators. Other analytical methods are described: immunohistochemistry, hormonal receptors study, flow cytometry and electron microscopy. A large place is also given to differential diagnosis, clinical course, histogenesis and originality of some phyllodes tumors. The authors stress the importance of wide excision and the contribution of frozen sections in surgical treatment.