Thyroidectomy (Total & Lobectomy)
What the Examiner Expects
Removal of one lobe (lobectomy) or the entire thyroid gland (total thyroidectomy). The examiner expects you to work up a thyroid nodule (TSH, ultrasound with TI-RADS classification, FNA based on Bethesda criteria), determine the extent of surgery, and describe the critical operative steps: identify and preserve the recurrent laryngeal nerve (RLN) bilaterally, identify and preserve the superior and inferior parathyroid glands, ligate the superior and inferior thyroid arteries, and dissect along the capsule of the thyroid to avoid injury to these structures. Berry's ligament (posterior suspensory ligament) is the most dangerous area where the RLN is closest to the thyroid.
Key Examiner Focus Points
- RLN identification is mandatory — runs in the tracheoesophageal groove
- Parathyroid glands must be identified and preserved (autotransplant if devascularized)
- Total thyroidectomy for: Graves' disease, bilateral disease, cancer > 4 cm, or with extrathyroidal extension
- Lobectomy acceptable for: thyroid nodule < 4 cm, low-risk well-differentiated cancer 1–4 cm
- Postop hypocalcemia is the most common complication of total thyroidectomy
Common Curveballs
During total thyroidectomy, you notice one parathyroid gland is devascularized and dusky
Autotransplant: mince the parathyroid gland into 1-mm pieces and implant into a pocket in the sternocleidomastoid muscle (or forearm). Mark the site with a clip or suture. Confirm parathyroid tissue histologically. This is a common and expected maneuver on the boards.
Patient develops stridor and respiratory distress 4 hours after total thyroidectomy
Neck hematoma with airway compromise — surgical emergency. Open the wound at bedside immediately (remove skin staples/sutures and evacuate the hematoma). Then return to the OR for definitive hemostasis. Do NOT attempt intubation first — opening the wound is the life-saving maneuver.
Postop PTH is undetectable and calcium is 7.2
Hypoparathyroidism from parathyroid devascularization or inadvertent removal. Start IV calcium gluconate for symptomatic hypocalcemia, then transition to oral calcium carbonate and calcitriol (active vitamin D). Most patients recover parathyroid function over weeks to months.
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