What is a thyroid adenoma?

A benign tumor: Adeno- is a medical prefix indicating glandular tissue. A benign tumor arising within a gland is called an adenoma; a malignant, or cancerous, tumor would be an adenocarcinoma. So a thyroid adenoma would be a benign tumor arising in the thyroid gland. Even though it's considered benign, it can cause problems by making it hard to swallow, or making too much thyroid hormone.

Benign, non-cancer: Growth in thyroid gland.