Endocrine Abstracts

Introduction: Regardless of the fact that the incidence of thyroid cancer has increased significantly in recent years, the simultaneous occurrence of multiple tumors in one thyroid gland is still a rare phenomenon. These tumors have the morphology, either of a single mass with mixed histological features, or of a single lesion consisting of two distinct cell-populations, or of two different tumors between which normal thyroid tissue is interposed. Various theories have been pr...