Follicular thyroid carcinoma with metastasis to skin diagnosed by fine needle aspiration cytology.

In April 2006, a 55-year-old female presented with a thyroid mass and multiple skin nodules on scalp, forehead and neck. Fine needle aspiration cytology of thyroid mass and multiple skin nodules show tumor cells clusters in a repetitive microfollicular pattern on May-Grunwald-Giemsa stain suggestive of follicular thyroid carcinoma with metastasis to skin. Although follicular carcinoma have a propensity for vascular invasion and hematogenous dissemination, skin is not commonly involved. Only a few cases of cutaneous metastasis from follicular thyroid carcinoma are reported in the English language literature.