A rare metastasis in the hand: a case of cutaneous metastasis of choriocarcinoma to the small finger.

Gestational choriocarcinoma is a malignant epithelial neoplasm of trophoblastic cells derived from any form of a previously normal or abnormal pregnancy. Choriocarcinoma is a rapidly invasive, widely metastasizing, malignant neoplasm. Hand and cutaneous metastases are rare and only one other report describing hand involvement was found in the literature. A 33-year-old woman was referred for evaluation of a papular lesion (6 x 4 mm) at the junction of the hyponychium and the nail bed of the dominant right small finger. At the time, she was being treated for choriocarcinoma with lung and brain metastases. Histopathology studies showed that the soft-tissue lesion from the patient's finger was a cutaneous metastasis of choriocarcinoma.