Atypical case of choriocarcinoma with breast metastasis.

Choriocarcinoma is a pure epithelial tumor composed of syncytiotrophoblastic and cytotrophoblastic cells with common metastases to the lung, vagina, liver, kidney, and brain [1]. Metastasis to the breast is very rare [2]. Since choriocarcinoma is a rapidly invasive, widely metastasizing malignancy with good response to chemotherapy, it is important to obtain early diagnosis for better outcome [3]. Because of the rarity of the disease and the importance of early detection and management, we report a case of choriocarcinoma presenting with a breast lump.