A nodule on the scalp as the first sign of extranodal disease in medullary thyroid carcinoma.

Medullary carcinoma of the thyroid gland accounts for only 5-10% of thyroid carcinomas. Also, metastases to the skin of malignant tumors are infrequently (2-9% of patients). In the case herein reported in a 64-year old woman, a metastatic nodule on the scalp was the presenting clinical manifestation of a medullary thyroid carcinoma.