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Hypocalcemia after thyroidectomy — USMLE Step 3 MCQ

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HardSurgery (post-operative, follow-up)Hypocalcemia after thyroidectomyUSMLE Step 3

A 59-year-old woman had thyroidectomy yesterday. She now has perioral numbness and hand cramping. Chvostek sign is present. Calcium is 7.0 mg/dL and phosphorus is 5.4 mg/dL. Surgical wound is clean and voice is normal. Which of the following is the most likely diagnosis?

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Correct answer: EPostoperative hypoparathyroidism

Hypocalcemia with hyperphosphatemia and tetany after thyroidectomy suggests transient or permanent hypoparathyroidism due to parathyroid gland injury or devascularization.

Reference: Endocrine surgery postoperative care guidance