Endocrine Abstracts

IntroductionThe term collision tumor refers to the coexistence of two histologically distinct malignant neoplasms. The two malignancies can originate from the same organ or occur as metastases from other regions. This type of tumors involving the thyroid gland are especially rare. Reported cases are usually involving papillary thyroid carcinomas in coexistence with other types of tumors like medullary carcinoma, follicular carcinoma or metastasic disease...