follicular thyroid adenoma (Monarch Disease Ontology identifier MONDO_0005032) is a benign, encapsulated tumor, arising from the follicular cells of the thyroid gland. It may be associated with thyroid hormone secretion but it does not have malignant characteristics. Also known as: adenoma of the thyroid, adenoma of the thyroid gland, adenoma of thyroid, adenoma of thyroid gland, adenoma, follicular cell, benign, follicular adenoma, follicular adenoma (morphologic abnormality), follicular adenoma of the thyroid.