Hydatid cyst of thyroid: An unusual cause of stridor.

A rare case of hydatid cyst of the thyroid is reported, which presented with slow growing swelling of weck in thyroid region since two years and severe dyspmoea and stridor since S days. She was posted for emergency tracheostomy with provisional diagnosis of multimodular thyroid goitre. During surgery multiple hydatid cysts in left lobe of thyroid were found and all cysts were removed. Dyspnoea and stridor were relieved post-operatively. Pre-operative diagnosis of this condition is difficult; diagnosis is usually made at the time of Surgery.