Thyroidectomy — Procedure Guide, Recovery & Risks | MyMedicPlus

Thyroidectomy is the surgical removal of all or part of the thyroid gland — the butterfly-shaped endocrine gland in the front of the neck that produces thyroxine (T4) and triiodothyronine (T3) hormones regulating metabolism, heart rate, and body temperature. A total thyroidectomy removes the entire gland. A hemithyroidectomy (lobectomy) removes only one lobe. The extent of surgery depends on the underlying condition and is decided after multidisciplinary review. Total thyroidectomy requires lifelong levothyroxine hormone replacement therapy. Minimally invasive video-assisted thyroidectomy (MIVAT) is available at specialist centres for small thyroid lesions.

The extent of surgery depends on the indication: hemithyroidectomy (removal of one lobe) is appropriate for unifocal low-risk papillary thyroid cancer under 4 cm with no high-risk features, and for indeterminate thyroid nodules (Bethesda IV/V cytology) requiring excision for histological diagnosis. Total thyroidectomy is performed for larger, bilateral, or high-risk thyroid cancer, Graves' disease requiring surgery, and large compressive goitre. The procedure may be performed via open Kocher incision (gold standard), endoscopic transaxillary, or robotic-assisted approaches at specialist centres to avoid neck scarring. Thyroid cancer is the most common endocrine malignancy, with papillary thyroid cancer representing 85% of cases and having an excellent prognosis with surgery and radioiodine.

Thyroidectomy is indicated for thyroid cancer (papillary, follicular, medullary, anaplastic), large goitres causing compressive symptoms such as difficulty swallowing or breathing, Graves' disease unresponsive to antithyroid medications or radioactive iodine, toxic multinodular goitre, and indeterminate thyroid nodules on fine needle aspiration cytology (Bethesda IV-VI). Pre-operative evaluation includes laryngoscopy to assess vocal cord function, thyroid function tests, serum calcium, and neck ultrasound. Minimally invasive video-assisted thyroidectomy is available at specialist centres for selected patients with smaller thyroid lesions.

Thyroid nodule management follows the ATA (American Thyroid Association) or British Thyroid Association guidelines: nodules greater than 1 cm with suspicious ultrasound features (irregular margins, microcalcifications, hypoechogenicity, taller-than-wide shape) are biopsied by ultrasound-guided fine needle aspiration cytology (FNAC). Bethesda I–II cytology is benign; III–IV is indeterminate (surgical excision for diagnosis); V–VI is malignant/highly suspicious (total thyroidectomy). Central neck dissection (level VI lymph node clearance) is added for cytologically confirmed thyroid cancer with N1 nodal disease on pre-operative imaging.

Under general anaesthesia, a horizontal neck incision (typically 4-6 cm long) is made in a natural skin crease at the base of the neck. The strap muscles of the neck are retracted to expose the thyroid gland. The superior and inferior thyroid arteries are ligated close to the thyroid capsule to protect the four parathyroid glands. Critical structures — the recurrent laryngeal nerves controlling vocal cord movement — are identified under continuous intraoperative nerve monitoring and meticulously preserved. The gland is then removed and the wound closed with absorbable sutures or skin glue. The procedure takes 1-2 hours and a surgical drain may be placed at the surgeon's discretion.

Intraoperative parathyroid identification is critical — parathyroid glands are identified by their characteristic tawny-yellow colour and pedicle vascularity and preserved in situ on their vascular pedicle whenever possible. If devascularised, parathyroid tissue is immediately auto-transplanted in fragments into the sternocleidomastoid muscle to restore function. Near-infrared fluorescence imaging using indocyanine green (ICG) assesses parathyroid viability intraoperatively and is increasingly used at specialist centres to reduce hypoparathyroidism rates. Parathyroid glands must be carefully identified (typically 4 glands, each 3–5 mm) and preserved with their blood supply. Devascularised glands are auto-transplanted into the sternocleidomastoid muscle.

Thyroidectomy for well-differentiated thyroid cancer achieves excellent long-term outcomes — 10-year survival exceeds 95% for papillary thyroid cancer. Compressive goitre symptoms resolve immediately after surgery in over 95% of patients. Graves' disease is cured in essentially 100% of cases after total thyroidectomy, providing definitive management without ongoing medication. Experienced endocrine surgeons performing greater than 25 thyroidectomies per year have significantly lower complication rates than low-volume surgeons, with permanent recurrent laryngeal nerve injury rates below 1% and permanent hypoparathyroidism below 2%.

Minimally invasive approaches (transaxillary robotic, oral vestibular endoscopic) avoid visible neck scarring entirely — a significant benefit for young patients concerned about cosmesis. Molecular testing of indeterminate thyroid nodules (Afirma gene expression classifier, ThyroSeq v3) may reclassify Bethesda III/IV nodules as benign (negative predictive value 91–95%), potentially avoiding diagnostic hemithyroidectomy in nearly half of such cases. Post-operative radioiodine (I-131) ablation after total thyroidectomy for intermediate- and high-risk thyroid cancer reduces local recurrence rates and enables thyroglobulin as a cancer marker for surveillance.

Key risks include recurrent laryngeal nerve injury causing hoarseness (temporary 5-10%, permanent 1-2% at specialist centres), hypoparathyroidism causing low blood calcium (temporary 20-30%, permanent 1-3%), wound haematoma requiring re-exploration (1%), surgical site infection (under 1%), and hypothyroidism (universal after total thyroidectomy, requiring levothyroxine). Intraoperative nerve monitoring with an EMG endotracheal tube is used at specialist centres to reduce permanent nerve injury risk. A post-operative serum calcium check at 6 hours guides calcium supplementation decisions.

Hypoparathyroidism is the most common long-term complication of total thyroidectomy, resulting from inadvertent removal or devascularisation of all four parathyroid glands. Acute hypocalcaemia (tetany, perioral tingling, Chvostek's sign) occurs in 20–30% transiently and requires oral or IV calcium supplementation. Permanent hypoparathyroidism occurs in 1–3% at specialist centres and requires lifelong calcium and activated vitamin D (alfacalcidol or calcitriol) supplementation, with monitoring to avoid hypercalciuria and nephrocalcinosis. Superior laryngeal nerve (SLN) external branch injury causes weakness of the cricothyroid muscle, resulting in loss of high-pitched voice projection — relevant for singers and voice professionals.

Most patients are discharged within 24-48 hours. A surgical drain is sometimes placed and removed before discharge. A soft diet is recommended for 1-2 days due to swallowing discomfort. Calcium and active vitamin D (calcitriol) supplementation is prescribed after total thyroidectomy to prevent symptomatic hypocalcaemia. Levothyroxine is started on the first post-operative day after total thyroidectomy at the dose calibrated to achieve the target TSH level. The neck scar fades significantly over 6-12 months; silicone gel sheets and SPF30+ sunscreen applied from 6 weeks improve cosmetic outcome. Return to light activity in 1-2 weeks and full activity in 2-4 weeks.

After total thyroidectomy for thyroid cancer, patients require lifelong levothyroxine at a TSH-suppressive dose (TSH 0.1–0.5 mU/L for intermediate risk; TSH less than 0.1 for high risk) to reduce recurrence risk through suppression of TSH-stimulated tumour growth. After hemithyroidectomy, 15–20% of patients develop clinical hypothyroidism requiring levothyroxine. Serum thyroglobulin levels with anti-thyroglobulin antibodies are measured at 3–6 monthly intervals as a tumour marker for recurrence surveillance. Neck ultrasound is performed annually for 5 years in intermediate-risk cases and beyond in high-risk cases.