Acute Thyrotoxicosis Following a Horse-Induced Neck Trauma

We present a rare case of acute thyrotoxicosis in a man with horse-induced neck trauma.A 60-year-old man presented to our emergency department with a head and neck injury caused by a horse kick.Computed tomography revealed a hematoma in the right thyroid gland.Ultrasonography of the neck revealed a 1.4 cm sized heterogenous hypoechoic lesion with an irregular margin in the right lower pole, suggestive of a thyroid hematoma.A thyroid function test revealed elevated free thyroxine and free triiodothyronine levels and suppressed thyrotropin levels.A Tc-99m thyroid scan showed a mild diffuse decreased uptake in the thyroid gland, especially in the right lower pole.We monitored the thyroid function test results, which took 2 months to recover to the normal range.This case indicates that awareness of thyroid dysfunction and monitoring of thyroid function are vital in patients with neck trauma.