Benign Masses of the Thyroid

Adenomas

Comprise about seventy percent of solitary nodules.

Margins of adenomas are usually well delineated.

Adenomas may be either follicular or papillary and may be calcified.

Difficult to differentiate benign adenomas from carcinomas of the thyroid by imaging. Biopsy may be necessary.

Goiters

Diffuse enlargement of the thyroid gland.

Often found in association with iodine deficiency.

May be multinodular with areas of cystic degeneration, hemorrhage, or colloid formation.

Usually evaluated by nuclear studies.

Colloid Cyst

Common thyroid abnormality.

Cold nodule on nucs, cystic on ultrasound.

May have high signal with the T1 weighted MR images.

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