A 38 year old patient presented with tingling, numbness, paraesthesia, respiratory stridor and involuntary spasm of the upper extremities. She has undergone surgery for thyroid carcinoma a week ago. What is the most likely diagnosis?

The key is E. Hypocalcemia. [Hypocalcaemia may be due to accidental parathyroid gland removal during thyroidectomy. Tingling, numbness, peraesthesia and involuntary spasm of the upper extremities are well known features of hypocalcemia. Laryngospasm is also a feature in hypocalcaemia which may cause stridor].