Thyroid, parathyroid and adrenal surgery

• Endocrine surgery repairs or removes hormone-producing tissue: thyroid, parathyroid and adrenal glands. Done well, it cures, controls or relieves what medicine cannot.
• A thyroid nodule is common, but fewer than 1 in 10 is cancer. Surgery follows an ultrasound and, where needed, a needle biopsy and multidisciplinary team review, not the scan alone.
• Parathyroid surgery is offered on clear criteria: symptoms, end-organ disease (stones, fragility fractures, osteoporosis) or an albumin-adjusted serum calcium of 2.85 mmol/L or above. ^[6]
• A phaeochromocytoma must be alpha-blocked first (7 to 14 days before the operation), with beta-blockers held back until then; do not use beta-blockade alone. ^[7]
• The big complications after thyroid surgery are recurrent laryngeal nerve (RLN) injury, hypocalcaemia and bleeding into the neck. Your job after the operation is to spot bleeding and low calcium early.

By the end of this page you should be able to:

1. Decide when a thyroid nodule or goitre should be referred, biopsied and operated on.
2. List the indications for parathyroidectomy using a current guideline.
3. Explain why a phaeochromocytoma or a hormone-secreting adrenal adenoma needs adrenalectomy, and prepare the patient (alpha-blockade first).
4. Describe the steps of the three operations in outline and what the aftercare looks like.
5. Recognise and manage the complications: RLN palsy, hypocalcaemia, neck haematoma, adrenal failure and catecholamine crisis.
6. Apply the right guideline for the setting: ATA, AAES, BAETS/NICE in the UK.

Endocrine surgery is one of the few areas where the surgeon cures the disease outright: remove the single overactive parathyroid adenoma and the calcium falls; take out the pheochromocytoma and the catecholamine flood stops; remove a thyroid cancer completely and the patient is cured in most cases. The work is small-anatomy, high-stakes surgery (nerves the thickness of a guitar string, glands the size of a grain of rice), done in a multidisciplinary team with endocrinologists, radiologists, pathologists and anaesthetists.

This topic is organised as a procedure page: indications, anatomy, preparation, steps, aftercare, complications. Disease details live on their own pages (hyperthyroidism, hypothyroidism, thyroid neoplasms and nodules, hyperparathyroidism and hypocalcaemia, phaeochromocytoma, Cushing syndrome, primary hyperaldosteronism, adrenal insufficiency, multiple endocrine neoplasia), so cross-reference them rather than repeating them.

A few ranges help with counselling. Palpable thyroid nodules occur in about 1% of men and 5% of women; high-resolution ultrasound finds nodules in 19% to 68% of randomly selected people; fewer than 10% of nodules are malignant. Differentiated thyroid cancer (papillary and follicular) makes up more than 90% of thyroid cancers. Phaeochromocytomas and paragangliomas occur in roughly 1 to 2 cases per 100,000 people per year. Only about one-quarter (24%) of patients with a phaeochromocytoma show all three classic symptoms (headache, sweating, tachycardia); hypertension, sustained or episodic, is present in about 95%. ^[2][3][7][8]

The thyroid is a butterfly-shaped gland straddling the trachea. It sits under the strap muscles and in front of the longus colli. Its blood comes from the superior and inferior thyroid arteries; the venous drainage runs to the internal jugular veins. The recurrent laryngeal nerves (RLNs) run in the tracheo-oesophageal groove, usually just behind the inferior thyroid artery, and enter the larynx behind the cricothyroid joint. The superior laryngeal nerve's external branch runs with the superior thyroid vessels and is of greatest risk when the superior pole is taken.

The four parathyroid glands sit on the back of the thyroid (superior glands higher and more constant, inferior glands more variable, sometimes in the thymus or mediastinum). They are small, yellow-brown and supplied by the inferior thyroid artery; their tiny end arteries make devascularisation as dangerous as accidental removal. The surgeon looks for them at every thyroidectomy and marks them with a clip or a knot; if they must be taken, they can be minced and autotransplanted into a muscle pocket with a marker stitch.

Each adrenal gland sits on the upper pole of the kidney, retroperitoneally, each about the size of a walnut, in its own fat pad. It has a cortex (aldosterone outer, cortisol middle, androgens inner) and a medulla (catecholamines). Blood supply is generous and multiple: arteries from the inferior phrenic, aorta and renal artery; venous drainage is the right adrenal vein into the inferior vena cava and the left adrenal vein into the left renal vein. This asymmetry matters during surgery, especially on the right, where the gland sits next to the vena cava.

The most common reason a patient reaches an endocrine surgeon is a thyroid nodule. A nodule is a swelling in the thyroid; patients with nodules have an excess of thyroid ultrasound and biopsy relative to anything else they need. The job is to find cancers and avoid operating on nodules that will never matter.

Fine-needle aspiration cytology (FNAC, a thin-needle sample of cells) is the single most useful test, with a minimum adequacy target of 85% of diagnostic samples. Its false-negative rates by cytology category are roughly 5-12% for Thy1 (non-diagnostic), 0-5% for Thy2 (benign), 25% for Thy3a and 31% for Thy3f. FNAC diagnoses papillary cancer well but cannot reliably tell follicular cancer from follicular adenoma: that needs histology. Toxic (functioning) nodules can give indeterminate (Thy3a/Thy3f) results because of hypercellular follicular tissue, yet confirmed autonomous (toxic, "hot") nodules are rarely malignant, so they should not have routine FNAC unless other features worry you. Core biopsy is usually not needed; seeding is extremely rare (about 0.0011% versus 0.00012% for FNA). ^[2]

A few numbers from the 2025 ATA revision (as summarised in a peer-reviewed comparison) are useful for counselling: a suspected non-thyroidal neck lymph node smaller than 8-10 mm in the shortest dimension needs FNA to confirm malignancy if it changes treatment; and patients with more complex cancer surgery should be referred to a high-volume thyroid surgeon (25 to 50 thyroidectomies per year), who has lower complication rates. ^[4]

Primary hyperparathyroidism is overactivity of one or more parathyroid glands, usually a single adenoma, with raised or inappropriate parathyroid hormone and high calcium. Most people feel well. Surgery is the only durable cure. Do surgery when there are:

• symptoms of hypercalcaemia (thirst, frequent or excessive urination, constipation);
• end-organ disease (renal stones, fragility fractures or osteoporosis);
• an albumin-adjusted serum calcium of 2.85 mmol/L or above.

Medical care (cinacalcet, and bisphosphonates for bone) is reserved for those who are not fit for, or decline, surgery, or when surgery has failed. In pregnancy, offer parathyroidectomy during the second trimester where needed, and avoid cinacalcet and bisphosphonates (see the hyperparathyroidism topic for full detail).

Adrenal adenoma, hormone-secreting. A unilateral adrenalectomy cures most patients whose adenoma is making too much aldosterone or cortisol. For aldosterone-producing adenoma (Conn syndrome), surgery (usually laparoscopic, removing the whole gland) is the definitive option when the patient has a unilateral lesion; bilateral or mild disease is treated medically with mineralocorticoid receptor antagonists, and patients with several comorbidities may go straight to medical therapy. Confirm autonomy appropriately (for example, dexamethasone suppression testing when an adenoma and cortisol production are both present) before committing to the knife. For non-secreting, small, benign-appearing incidental adenomas, observation is appropriate; adrenal cancer, metastasis and very large or changing lesions need a different (often open) plan.

Phaeochromocytoma. An adrenal medullary tumour making adrenaline or noradrenaline. Surgery is the only curative treatment. Do not rush: the preparation period is where lives are saved.

Every patient having endocrine surgery needs:

1. A correct biochemical diagnosis before a knife is lifted. Treat the person (toxic thyroid, hypercalcaemia, catecholamine excess), not just the scan.
2. Baseline documentation of the voice: note hoarseness. Anyone with a thyroid mass and voice change needs laryngoscopy before the operation.
3. Baseline calcium and parathyroid hormone before neck surgery, and imaging of the parathyroids where a focused parathyroidectomy is planned.
4. Consent covering the specific complications: RLN palsy (hoarseness, aspiration), hypoparathyroidism and hypocalcaemia, bleeding, infection, hypothyroidism, scar and, for phaeochromocytoma, hypertensive crisis and adrenal failure.
5. Medications: thyrotoxic patients should be euthyroid first (antithyroid drug plus beta-blocker may be used preoperatively; iodide is sometimes added); calcium and vitamin D repletion where deficient; hold aspirin/anticoagulants as usual for neck surgery.

This is the single most important non-operative part of the whole topic. Alpha-blockade comes first; beta-blockers are held back until adequate alpha-blockade is established, because beta-blockade alone leaves alpha stimulation unopposed and can precipitate a hypertensive crisis.

• Start 7 to 14 days before the operation, and aim for at least 10 days of optimisation where feasible.
• Selective alpha-1 blockade (doxazosin 2 to 4 mg every 8 to 12 hours, or phenoxybenzamine 10 mg every 8 to 12 hours) is titrated up every 3 to 4 days; phenoxybenzamine is a non-selective, irreversible blocker. ^[7]
• Targets (Endocrine Society): seated blood pressure under 130 over 80, seated heart rate 60 to 70 per minute, standing systolic pressure 90 or above, standing heart rate 70 to 80 per minute. True alpha-blockade shows mild orthostatic hypotension and tachycardia; it takes weeks, not days. ^[7]
• Beta-blockers only if tachycardia persists after adequate alpha-blockade (several weeks later). Avoid labetalol as sole therapy (its beta-to-alpha ratio is about 3:1 orally, 7:1 intravenously). ^[7]
• Calcium channel blockers can be added or used instead.
• Metyrosine (250 to 500 mg every 6 hours) inhibits tyrosine hydroxylase, blocking catecholamine synthesis; reserve for intolerance or anticipated difficult resection. ^[7]
• Volume and salt: a high-sodium diet and liberal fluids after starting alpha-blockers expand the contracted intravascular volume, individualised to cardiac and renal status.
• Drugs to avoid preoperatively: diuretics (unless compelling indication), because these patients are intravascularly volume depleted.
• Children need alpha-blockade for at least 14 days before surgery. ^[7]

The patient is supine with the neck slightly extended. Through a transverse (Kocher) neck incision, strap muscles are separated and the thyroid lobe mobilised. Key habits that prevent disasters:

• Identify the superior thyroid vessels and divide them close to the gland, protecting the external laryngeal nerve.
• Divide the inferior thyroid artery branch by branch as it approaches the gland, not as a trunk, to spare the parathyroid blood supply.
• Find the recurrent laryngeal nerve visually, in the tracheo-oesophageal groove or under the inferior thyroid artery; a nerve monitor adds safety but does not replace seeing it. Neuromonitoring is used variably; a recent Spanish survey showed wide differences in how surgeons apply international nerve-monitoring guidelines.
• Preserve and mark the parathyroid glands, and autotransplant them if they are inadvertently removed or clearly devascularised.
• Check haemostasis before closing; drains are often not needed for small cases.
• Total thyroidectomy includes both sides in one operation; a completion thyroidectomy is performed after a diagnostic lobectomy when cancer is found.
• High-volume thyroid surgeons (25 to 50 thyroidectomies per year) have lower complication rates and better outcomes, a recommendation repeated by the 2025 ATA revision. ^[4]

Preoperative localisation (ultrasound, sestamibi scan, or CT) is used; some surgeons operate without it if all four glands are to be inspected, which is much less common now. Parathyroid tissue can be very visible.

• Focused/minimally invasive parathyroidectomy (MIP): remove the single abnormal gland, using local anaesthesia and sedation or a short general anaesthetic. Many centres use intraoperative parathyroid hormone measurement (a 50% fall within 10 minutes after removing the adenoma) but this varies by centre; follow local practice.
• Bilateral neck exploration: inspect all four glands; used when localisation is absent, disease is multigland or in MEN.
• Total parathyroidectomy with autotransplantation for multigland (renal or tertiary) disease; hungry bone syndrome is a real risk afterward.
• Reoperative parathyroid surgery (recurrence or missed adenoma) has higher complications; ask for an experienced surgeon and further localisation (ultrasound, sestamibi, CT, MRI).

Most are now laparoscopic (transperitoneal/Gagner or retroperitoneal/Walz), with all the benefits of less pain and shorter stay.

• Secretory adenoma: total unilateral adrenalectomy, laparoscopic in most. Partial (cortex-sparing) adrenalectomy is an option in selected cases, especially hereditary or bilateral disease, but carries a higher local recurrence risk. For phaeochromocytoma related to SDHB mutation, cortex-sparing surgery is generally not advised (high metastatic risk and low bilateral disease risk); for children with SDHD or other syndromes it is preferred to avoid lifelong steroid dependence.
• Phaeochromocytoma: tumour manipulated as little as possible until the adrenal vein is ligated; early adrenal vein control is the rule because manipulation floods catecholamines. Open surgery is preferred for tumours over 6 cm or for invasive disease, and laparoscopic or robotic conversion is always ready. ^[8]
• Bilateral adrenalectomy (Cushing disease after failed transsphenoidal surgery, or bilateral disease) permanently depletes cortisol: plan steroid replacement before and for life, but do not give routine perioperative stress-dose steroids before a phaeochromocytoma is removed (glucocorticoids can precipitate a crisis).
• Right-sided glands are near the vena cava and have a short adrenal vein; left-sided operations may require splenic mobilisation.

• Airway first. Inspect the wound, patient positioning and respirations; neck swelling or stridor in the first 6 hours is a haematoma until proved otherwise (open the wound immediately, even at the bedside, then take to theatre).
• Voice: hoarseness worse than baseline, breathy voice or a high-pitched weak cough suggests recurrent laryngeal nerve palsy and possible aspiration. Bilateral injury is rare but is an airway emergency.
• Calcium and PTH monitoring; ask about perioral or finger tingling. (See the hypocalcaemia topic for replacement doses.)
• Levothyroxine replacement after total thyroidectomy, titrated to thyroid-stimulating hormone by the responsible clinician. After lobectomy, 20-30% become hypothyroid and need checking.
• Send the specimen for histopathology and review at the MDT; the lymph node and margins decide adjuvant radioactive iodine and TSH suppression.

• Monitor calcium (ionised or albumin-adjusted). Mild tingling is expected and managed; severe or symptomatic hypocalcaemia needs intravenous calcium.
• Watch for hungry bone syndrome after large adenomas or multigland disease (rapid calcium uptake into bone, high alkaline phosphatase, falling phosphate): prolonged parenteral calcium may be needed.
• Check the parathyroid hormone behaves as expected, and after single-gland surgery reassure the patient that most patients are cured.

• Move the patient to a monitored bed. After the tumour is out the circulation is vasodilated; hypotension is expected and replaced with fluid first, then vasopressors without delay if pressure does not recover.
• Monitor glucose (hypoglycaemia is common for 24 to 48 hours), as catecholamine withdrawal unmasks insulin effect; nurse with glucose to hand and re-check.
• Steroid coverage only for bilateral cases or documented adrenal insufficiency; otherwise cortisol normalises within days.
• Continue blood pressure surveillance: some hypertension persists from underlying renovascular and renin-angiotensin disease.

In one contemporary European series, the overall complication rate was 31.7%, with transient postoperative hypocalcaemia the commonest (25.3%). Permanent hypocalcaemia occurred in 1.9%, haemorrhage in 3.5% and RLN palsy in 1.3% of patients; one patient (0.3%) had a permanent nerve palsy. Accidental parathyroid excision was found in 32%. The authors' rates for permanent hypocalcaemia and permanent RLN palsy fall within the internationally reported 1-3% and 0.5-2% in high-volume endocrine centres. ^[1]

The RLN can be bruised, stretched, cauterised or divided at the ligament of Berry, especially with large goitres, reoperative surgery and retrosternal extension. Unilateral injury gives hoarseness and a breathy voice and poor cough (aspiration risk); bilateral injury gives stridor and an acute airway problem. Transient palsy recovers within 6 months; later is permanent. Postoperative vocal cord assessment and speech therapy matter, and many improve over time. Avoid intraoperative diathermy close to the nerve.

The commonest early complaint is perioral and digital tingling. Causes:

• Stunning or devascularisation of parathyroid glands (temporary, usually resolves within days).
• Accidental removal (permanent, needing lifelong calcium and active vitamin D).
• Hungry bone syndrome (persistent hypocalcaemia and hypophosphataemia after removal of a large adenoma or parathyroidectomy).
• Haemodilution in the first 24 hours can mimic it; repeat the test before treating.

Replace calcium, with or without calcitriol (active vitamin D), following your local hypocalcaemia protocol, and recheck frequently, because both undertreatment and overtreatment carry harm (renal stones, nephrocalcinosis).

Neck haematoma after thyroid or parathyroid surgery is uncommon but time-critical. Warning signs: pain out of proportion, swelling, dyspnoea, swallowing blood, stridor, a falling oxygen saturation. Management: sit the patient up, give oxygen, and open the wound immediately (release clips/stitches or sutures) to decompress before definitive re-exploration. Keep instruments at the bedside for the first 24 hours on a high-risk list and know who to call.

• Infection: rare; treat as a surgical-site infection.
• Hypothyroidism: almost universal after total thyroidectomy; expected.
• Scar and cosmetic issues: usually minimal with modern incisions; keloid in susceptible skin.
• For parathyroidectomy: failure to find an ectopic or mediastinal adenoma, persistent or recurrent disease, (rare) RLN injury on reoperation.
• For phaeochromocytoma: intraoperative catecholamine surges (arrhythmia, hypertensive crisis), post-removal vasoplegia, hypoglycaemia, and complications from adrenergic blockade (orthostatic hypotension).

• A surgeon who performs fewer than a handful of thyroidectomies a year will have worse outcomes; refer to the regional centre rather than attempting rare, complex neck surgery locally.
• TSH, serum calcium and a good neck ultrasound are the minimum diagnostic set; FNAC improves further and is cheap when a trained pathologist exists.
• Bleeding in the neck is solved by opening the wound, not by waiting for theatre.
• Phaeochromocytoma preparation needs alpha-blockers and blood pressure monitoring for two weeks: if these are unavailable, refer early to a centre that can provide them. Never operate on a suspected phaeochromocytoma without blockade.
• After total thyroidectomy where thyroxine or calcitriol is scarce, arrange follow-up and the longest possible supply; 400 mg of calcium carbonate contains about 400 mg? Follow the local formulary rather than a remembered number.
• Train the whole team in measuring corrected calcium and in reading neck drains so complications are caught on the ward.

• Surgery is one step in a pathway: nodule ultrasound and FNA, MDT and a high-volume thyroid surgeon give the best cancer and complication outcomes.
• Thyroid nodule: fewer than 10% malignant; use a recognised ultrasound score and 85% FNA adequacy; core biopsy only in defined cases.
• Parathyroidectomy: offer for symptoms, stones/fractures/osteoporosis or calcium 2.85 mmol/L or above; beware FHH.
• Phaeochromocytoma: alpha-blockade 7 to 14 days first, then (if needed) beta-blockade; beta-blockers alone are dangerous.
• Complication rates in one series: transient hypocalcaemia 25.3%, permanent 1.9%, bleed 3.5%, RLN palsy 1.3% (0.3% permanent).
• Post-thyroidectomy neck swelling in the first 6 hours is a haematoma: open the wound immediately.
• Partial adrenalectomy spares cortex but has higher local recurrence; in SDHB phaeochromocytoma the cortex is usually taken with the tumour.
• Phaeochromocytoma surgery is laparoscopic, open for tumours over 6 cm or invasion; RLN and parathyroid practices vary by region and resource.

• Hypocalcaemia, hypercalcaemia and hungry bone syndrome after neck surgery.
• Hyperparathyroidism, hypothyroidism, hyperthyroidism, thyroid function tests and thyroid neoplasms.
• Phaeochromocytoma, Cushing syndrome, primary hyperaldosteronism and adrenal insufficiency.
• Multiple endocrine neoplasia.
• Postoperative pain, wound infection and emergency airway care.