Journal of Research in Medical Sciences1735-199516520110515Choriocarcinoma of the breast; a case report and review of literatures66186618ENSiminHematiOmidEsnaashariRadiation Oncologist, Department of Radiation Oncology, Orumieh Medical University, Orumieh, Iran. esna3229@yahoo.comMohammad RezaMohajeriMostafaSarvizadehMehriSirous2011011320110514Choriocarcinoma is an extremely rare pathology among breast malignancies. It is introduced by two distinct terms in the literatures: breast cancer with choriocarcinomatous features and metastatic choriocarcinoma to the breast. In this case report, the history, physical examination, laboratory findings, imaging studies, and pathological findings of breast choriocarcinoma in a 41-year-old woman are described and previous literatures about choriocarcinoma in the breast are reviewed.Keywords: Choriocarcinoma, Breast, Carcinoma, Choriocarcinomatous, Metastatic