AN UNUSUAL CASE OF PAPILLARY CARCINOMA OF THE THYROID WITH CUTANEOUS AND BREAST METASTASES ONLY

Cutaneous metastases of thyroid carcinoma are infrequent and, when pre sent, are usually located in the vicinity of a widespread primary tumo r. Breast metastases from these tumors are even less common. We report the case of a 64-year-old female with a toxic multinodular goiter in whom a fine-needle biopsy, performed in 1985 at the age of 52, was sug gestive of papillary carcinoma of the thyroid. Total thyroidectomy for a papillary carcinoma, follicular variant, was performed in 1988. Fou r months after surgery, a cutaneous metastasis was discovered in the r ight thigh. Surgical excision of this lesion followed by treatment wit h radioactive iodine decreased serum Tg levels from 7495 to 3.3 mu g/l . Under suppressive therapy with L-thyroxine, serum Tg remained undete ctable for the next 4 years. Then, serum Tg levels rose to 3.9-5.6 mu g/l and a second cutaneous metastasis was removed from the abdominal w all. The patient was again treated with radioactive iodine and the pos t-treatment whole-body scan did not show any area of increased uptake of the radionuclide. However, serum Tg levels under suppression with L -thyroxine remained elevated at 4-20 mu g/l for the next 2 years. In A ugust 1995, a 1.5 cm nodule was found in the right breast. Cytological examination was suggestive of a breast metastasis from thyroid. carci noma and the lesion was removed by enucleation. This proved to be a me tastasis from a papillary carcinoma of the thyroid. Elevated (19-44 mu g/l) serum Tg levels persisted postoperatively. A third cutaneous met astasis was revealed by I-131 scintigraphy in the right buttock and su rgically removed in December 1996. Serum Tg levels have remained undet ectable since then. To the best of our knowledge, this is a unique cas e of a papillary carcinoma of the thyroid with a propensity to metasta size only to the skin and breast during a follow-up of 11 years.