Hurthle cell carcinoma arising from thyroid papillary carcinoma.

Hurthle cell carcinoma of the thyroid is generally considered to be a subtype of follicular carcinoma. We report a case of a small solitary usual-type papillary carcinoma of the thyroid, with metastatic tumor in cervical lymph nodes. The lymph node tumor consisted of both tall-cell papillary carcinoma and Hurthle cell carcinoma. This suggests a closer relationship between papillary cell carcinoma and Hurthle cell tumors than previously appreciated.