[The problem of cysto-sarcoma phyllodes (author's transl)].

Problems in the diagnosis and treatment of cysto-sarcoma phyllodes in thirteen women are discussed. This is a rare breast tumour which must be regarded as semi-malignant. Its malignancy consists of its tendency to recurrence and the development of distant metastases. Five patients had one or more recurrences and three patients had metastases which were fatal. Radiological and thermographic diagnosis of small tumours is unreliable. It is not possible to distinguish the benign from the malignant variants. Accurate classification depends on histological examination. The authors consider removal of the glandular tissue or simple mastectomy to be the best form of treatment.