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A thyroidectomy is an operation that involves the surgical removal of all or part of the thyroid gland. Surgeons often perform a thyroidectomy when a patient has thyroid cancer or some other condition of the thyroid gland (such as hyperthyroidism) or goiter. Other indications for surgery include cosmetic (very enlarged thyroid), or symptomatic obstruction (causing difficulties in swallowing or breathing). Thyroidectomy is a common surgical procedure that has several potential complications or sequela including: temporary or permanent change in voice, temporary or permanently low calcium, need for lifelong thyroid hormone replacement, bleeding, infection, and the remote possibility of airway obstruction due to bilateral vocal cord paralysis. Complications are uncommon when the procedure is performed by an experienced surgeon. The thyroid produces several hormones, such as thyroxine (T4), triiodothyronine (T3), and calcitonin. After the removal of a thyroid, patients usually take a prescribed oral synthetic thyroid hormone - levothyroxine (Synthroid) - to prevent hypothyroidism. Less extreme variants of thyroidectomy include: * "hemithyroidectomy" (or "unilateral lobectomy") -- removing only half of the thyroid * "isthmectomy"—removing the band of tissue (or isthmus) connecting the two lobes of the thyroid A "thyroidectomy" should not be confused with a "thyroidotomy" ("thyrotomy"), which is a ''cutting into'' (-otomy) the thyroid, not a ''removal'' (-ectomy) of it. A thyroidotomy can be performed to get access for a median laryngotomy, or to perform a biopsy. (Although technically a biopsy involves removing some tissue, it is more frequently categorized as an -otomy than an -ectomy because the volume of tissue removed is minuscule.) == Indications == * Thyroid cancer * Toxic thyroid nodule (produces too much thyroid hormone) * Multinodular goiter (enlarged thyroid gland with many nodules), especially if there is compression of nearby structures * Graves' disease, especially if there is exophthalmos (bulging eyes) * Thyroid nodule, if fine needle aspirate (FNA) results are unclear〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「thyroidectomy」の詳細全文を読む スポンサード リンク
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