Thyroidectomy


A thyroidectomy is an operation that involves the surgical removal of all or part of the thyroid gland. In general surgery, endocrine or head and neck surgeons often perform a thyroidectomy when a patient has thyroid cancer or some other condition of the thyroid gland or goiter. Other indications for surgery include cosmetic, or symptomatic obstruction. Thyroidectomy is a common surgical procedure that has several potential complications or sequelae 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, triiodothyronine, and calcitonin. After the removal of a thyroid, patients usually take a prescribed oral synthetic thyroid hormone—levothyroxine —to prevent hypothyroidism, the deficiency of these hormones.

Variants

Less extreme variants of thyroidectomy include:
  • hemithyroidectomy : removing only half of the thyroid
  • isthmectomy or isthmusectomy: removing the band of tissue connecting the two lobes of the thyroid
Traditionally, the thyroid has been removed through a neck incision that leaves a permanent scar. More recently, minimally invasive and "scarless" approaches such as transoral thyroidectomy have become popular in some parts of the world. These approaches have been associated with reduced pain and better quality of life in some studies. There are a few centers of excellence in the United States that perform this surgery often, while most centers do not routinely offer remote access surgery. Traditional thyroid surgery is a common procedure, performed over 100,000 times per year.
A thyroidectomy should not be confused with a thyroidotomy, which is a cutting into the thyroid, not a removal of it. A thyroidotomy can be performed to get access for a median laryngotomy, or to perform a biopsy.

Uses

Thyroidectomy is used in the treatment of:
  • Thyroid cancer
  • Toxic thyroid nodule
  • Multinodular goiter, especially if there is compression of nearby structures
  • Graves' disease, especially if there is exophthalmos
  • Thyroid nodule, if fine needle aspirate results are unclear

    Types

  • Hemithyroidectomy — Entire isthmus is removed along with 1 lobe. Done in benign diseases of only 1 lobe.
  • Subtotal thyroidectomy — Removal of majority of both lobes leaving behind 4-5 grams of thyroid tissue on one or both sides—this used to be the most common operation for multinodular goitre.
  • Partial thyroidectomy —Removal of gland in front of trachea after mobilization. Done in nontoxic MNG. Its role is controversial.
  • Near total thyroidectomy — Both lobes are removed except for a small amount of thyroid tissue in the vicinity of the recurrent laryngeal nerve entry point and the superior parathyroid gland.
  • Total thyroidectomy — Entire gland is removed. Done in cases of papillary or follicular carcinoma of thyroid, medullary carcinoma of thyroid. This is now also the most common operation for multinodular goitre.
  • Hartley Dunhill operation — Removal of 1 entire lateral lobe with isthmus and partial/subtotal removal of opposite lateral lobe. Done in nontoxic MNG, but rarely performed in the United States.

    Complications

  • Hypothyroidism in more than 20% of patients.
  • Laryngeal nerve injury in about 1% of patients, in particular the recurrent laryngeal nerve: Unilateral damage results in a hoarse voice. Bilateral damage presents as laryngeal obstruction after surgery and can be a surgical emergency: an emergency tracheostomy may be needed. Recurrent Laryngeal nerve injury may occur during the ligature of the inferior thyroid artery.
  • Hypoparathyroidism temporary in many patients, but permanent in about 1 to 4% of patients
  • Anesthetic complications
  • Infection, possibly an increased risk with chronic pre-operative steroid use.
  • Stitch granuloma
  • Chyle leak
  • Haemorrhage/Hematoma
  • Removal or devascularization of the parathyroids

    History

, a tenth century Arab physician, sometimes referred to as the "father of surgery", is credited with the performance of the first thyroidectomy.