Follicular Tumor in the Sellar Region Without Primary Cancer of the Thyroid: Heterotopic Carcinoma?

Abstract

A case of a follicular tumor in the sellar region is described without evidence of a primary tumor within the thyroid gland or at a site known to harbor ectopic thyroid tissue. Large amounts of thyroglobulin were readily demonstrated mainly within the colloid of the follicles. The possible development from heterotopic thyroid tissue at this unusual site is discussed.