RT Journal Article SR Electronic T1 Astonishingly rapid growth of malignant cystosarcoma phyllodes tumor in a pregnant woman— a case report JF International Journal of Gynecologic Cancer JO Int J Gynecol Cancer FD BMJ Publishing Group Ltd SP 856 OP 859 DO 10.1136/ijgc-00009577-200807000-00041 VO 18 IS 4 A1 D Nejc A1 G. Pasz-Walczak A1 J. Piekarski A1 P. Pluta A1 A. Bilski A1 P. Sek A1 P. Potemski A1 A. Durczynski A1 K. Wronski A1 A. Jeziorski YR 2008 UL http://ijgc.bmj.com/content/18/4/856.abstract AB There are very few reports concerning the presence of malignant cystosarcoma phyllodes (CSP) in breasts of pregnant women. In the hereby described case, a 28-year-old woman presented in our department with huge (18 × 11 × 8 cm) tumor of left breast, 2 weeks after labor. The patient discovered a tumor in 34th week of pregnancy, 6 weeks before labor. Histopatholgic examination of excised tumor revealed the presence of malignant CSP tumor. Simple mastectomy was proposed to patient as a best treatment modality. However, the patient refused. She underwent excision of tumor bed (2-cm tumor-free margin was achieved). Despite insufficient treatment, she remains free of disease 20 months after the wide excision of breast malignancy. It is not known how pregnancy influences prognosis of patients with malignant CSP. Lack of such information prompted us to describe the clinical course of our patient.