BSIP, ALEXANDRE / SCIENCE PHOTO LIBRARY BSIP, ALEXANDRE / SCIENCE PHOTO LIBRARY
Surgery. Surgeons performing an operation on a patient's thyroid gland. The thyroid is a gland in the neck that secretes hormones that control the metabolism. Disorders of the thyroid include cancer, hyperthyroidism (overproduction of thyroid hormones) or goitre (enlargement of the gland).
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