Abstract
Cutaneous metastases from thyroid carcinomas are extremely rare; however, the scalp is a common site for cutaneous metastases from follicular thyroid carcinomas (FTCs). We report the case of a 77-year-old male patient with a blood-rich scalp lesion. Histopathological tests of punch biopsy specimens revealed subcutaneous well-formed follicular structures that were similar to those found in the thyroid gland. Immunohistochemistry using thyroid transcription factor-1 (TTF-1) and paired-box gene family 8 (PAX8) revealed an FTC metastasis. We performed total thyroidectomy and resection of the scalp lesion at the same time and administered postoperative radioactive iodine treatment. The primary thyroid lesion was diagnosed as an FTC based on extracapsular extension and vessel invasion. The patient has not experienced disease recurrence since the treatment. When scalp metastasis of thyroid carcinoma is suspected, we recommend total extirpation, including the primary tumor and scalp metastasis, for an improved prognosis.
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