A 52-year-old female with a thyroglossal duct cyst extending into the larynx is reported. She had complained of an abnormal sensation in the larynx and laryngeal findings showed a diffuse smooth moderate swelling in the left vocal cord with out disturbance of vocal cord movements. This cyst passed through the hyoid bone beneath the attachment of the thyrohyoid membrane and extended into the left false vocal cord through the aryepiglottic fold. Diagnosis was not established until the tract was followed in its passage through the hyoid bone and upward to the base of the tongue during surgery. Pathological fundings of the excised cyst showed thyroid tissue and small lymph follicles in the wall of the cyst.
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