BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Thyroid nodule. Light micrograph of a section through a thyroid gland with a colloid adenoma, or nodule (centre). The nodule is filled with colloid, a glycoprotein storage form of the thyroid hormones, and is encapsulated in fibrous tissue. The nodule can lead to an enlargement of the thyroid gland and overproduction of thyroid hormone.
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