Thyroglossal Duct Cyst With Endolaryngeal Extension

Thyroglossal duct cyst (TDC) arises from the remnant thyroglossal duct tract as a cystic expansion. Patients most commonly present with a palpable cystic midline neck mass or discharge from a cervical sinus opening. TDC is the most common congenital head and neck lesion in children and adults, but endolaryngeal extension is a rare entity. The treatment of TDC is excision of the cyst and the whole sinus tract with the central part of the hyoid bone, as described by Sistrunk. It is necessary to preserve the thyrohyoid membrane and thyrohyoid perichondrium of the thyroid cartilage in cases with endolaryngeal extension. In this report, a case of TDC with endolaryngeal extension is presented, with diagnosis and management modalities.