Total thyroidectomy

Why are we operating?

Shared foundations

What the surgeon is thinking

• Access

  Why is the approach almost bloodless when done correctly?

  The collar incision follows skin creases, subplatysmal flaps ride a plane above the veins, and the strap muscles part at the midline raphe, an embryological seam. The operation reaches the gland without dividing anything that bleeds, which is exactly why bleeding later stands out as an alarm.

• Mobilisation and vessel control

  Why are the vessels ligated tight against the gland's capsule?

  Distance is danger: the superior pole's external laryngeal nerve (the voice's pitch) runs just medial to the superior thyroid vessels, and the parathyroids live on tiny branches of the inferior artery. Capsular ligation takes the gland's supply exactly at the gland, sparing everything that merely passes nearby.

• The recurrent nerve and the parathyroids

  What does 'the nerve is found, not avoided' mean?

  The recurrent laryngeal nerve is actively identified in the tracheo-oesophageal groove and traced to its laryngeal entry near Berry's ligament, because unseen nerves are the ones injured: the most dangerous millimetres are the last, where the nerve hugs the gland. Each parathyroid is preserved on its blood supply, and one devascularised is autotransplanted into muscle rather than discarded.

• Haemostasis and closure

  Why does the closure include a Valsalva?

  The anaesthetist raises venous pressure while the surgeon watches: veins that bled at low pressure declare themselves now instead of at midnight. The pretracheal space cannot stretch, so the haematoma that forms there compresses laryngeal veins and swells the airway shut, which is why the bedside clip-removal drill exists on every post-thyroid ward.

Decision points

• The nerve monitor's signal is lost after the first lobe of a planned total thyroidectomy.

  • Stage the operation: stop after one side

    A possible unilateral palsy is a voice problem; bilateral palsy is a tracheostomy: staging converts a catastrophe risk into a second anaesthetic.

  • Proceed to the second side

    Defensible only if signal loss is confidently artefactual and the doctrine was agreed beforehand: the stakes make optimism expensive.

  Bilateral recurrent nerve palsy closes the glottis: the staged answer exists because no completion is worth that risk. Intraoperative monitoring's chief value is exactly this decision, and units agree the rule before the case, not during it.

• Lobectomy or total thyroidectomy for a 2.5 cm papillary cancer?

  • Lobectomy

    Modern guidance accepts it for smaller, low-risk cancers: half the nerve exposure, parathyroids untouched on one side, often no hormone dependence.

  • Total thyroidectomy

    Larger, bilateral or higher-risk disease, and where radioiodine therapy or thyroglobulin surveillance is planned: the complete answer with the complete risk profile.

  The extent debate is a risk trade priced by the tumour's biology: the MDT stratifies, and the consent conversation names both the oncology and the specific costs (voice, calcium, hormone dependence) of each answer.