What is an adenomatoid nodule?

An adenomatoid nodule is formed by increased growth of normal thyroid tissue. When tissue from an adenomatoid nodule is examined under a microscope, it shows normal-appearing epithelial cells organized into large and small spherical follicles along with large amounts of colloid (the storage form of thyroid hormone). Tissue from an adenomatoid nodule may show areas of degeneration with collections of dead cells and blood. Adenomatoid nodules are benign. While they occasionally continue to grow larger, they will not spread beyond the thyroid gland to other parts of the neck or other areas of the body. These nodules may also be referred to as adenomatous nodules, colloid nodules, or hyperplastic nodules.

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