[Clear-cell carcinoma of the thyroid gland]

The case of a 66-year old woman is presented involving the partial transformation of follicular carcinoma with a solid somponent into clear-cell carcinoma of the thyroid gland. The carcinoma in its follicular component was seen invading the capsule, striated muscle, and vessels, and metastasizing in the form of a solitary metastasis into the ilium. Postmortem examination ruled out any other aetiology of the clear-cell carcinoma.