Cutaneous Metastasis of Papillary Thyroid Carcinoma: Iatrogenic Cause? / 대한피부과학회지

ABSTRACT

Cutaneous metastasis of papillary thyroid carcinoma is very rare and is a marker for wide dissemination. A 62-year-old woman presented with an asymptomatic, solitary, bean sized bluish nodule on the right anterior neck. She noticed the lesion 2 years ago and the nodule had been steadily enlarging. Five years ago, she underwent fine needle aspiration biopsy, right lobectomy, and total thyroidectomy and was diagnosed with papillary thyroid carcinoma. Since then, she has received radioactive iodine treatment three times and gone through whole body PET-CT scan twice, which revealed nonspecific findings. A biopsy specimen showed a well demarcated nodule consisting of many tumor cells with multiple follicular structures in the dermis. Tumor cells had ground glass nuclei, nuclear pseudoinclusions and nuclear grooves, and stained positive for thyroid transcription factor-1 and thyroglobulin. Herein, we report a case of cutaneous metastasis of papillary thyroid carcinoma suspected of iatrogenic cause.