Background. Nonepithelial malignant tumours of the breast are rare. In this article 7 cases of the malignant phyllodes tumour and 2 cases of the primary breast lymphoma are presented.

Materials and methods. 1269 patients with breast malignancies were treated at the Department of Breast Diseases and Oncology of the Institute of Oncology, Vilnius University, during the period 1998–2000. There were only 7 cases (0.7%) of malignant phyllodes tumour (malignant cystosarcoma phyllodes) among all the breast tumours. All patients were female. Women’s age ranged from 40 to 85 years and the mean age was 54 years. Two patients were in clinical stage II and five patients in clinical stage III of the disease. Five patients were treated by radical mastectomy, one patient by quandrantectomy. Sectoral resection was performed to one patient who suffered from heart disease. Two patients with primary breast lymphoma were during the 2000–2005 period. Patients were 80 years and 78 years old. Both patients were in 1st stage of the disease. One patient had a large diffuse B cell lymphoma; the second one had unspecified non-Hodgkin’s lymphoma. Sectoral resections of the breast were performed for both patients followed by radiotherapy.

Results. Five patients with malignant phyllodes tumour are alive. One patient died from dissemination of the breast tumour after 3 months, and one patient died from another malignant tumour after 9 months. Two patients with breast lymphoma are alive.

Conclusions. 1. Clinical behaviour of malignant phyllodes tumour is benign in most cases, while rapid dissemination of the tumour appears in some cases. 2. Primary lymphoma of the breast has a benign clinical course.

Keywords: malignant phyllodes tumour; primary lymphoma of the breast