In this case, it may result in symptomatic hyperthyroidism, and may be referred to as a toxic thyroid adenoma.

The typical thyroid adenoma is solitary, spherical and encapsulated lesion that is well demarcated from the surrounding parenchyma.

The color ranges from gray-white to red-brown, depending upon Areas of hemorrhage, fibrosis, calcification, and cystic change, similar to what is found in multinodular goiters, are common in thyroid (follicular) adenoma, particularly in larger lesions.

[7] In contrast, a multinodular goiter is usually thought to result from a hyperplastic response of the entire thyroid gland to a stimulus, such as iodine deficiency.

[7] Most patients with thyroid adenoma can be managed by watchful waiting (without surgical excision) with regular monitoring.