갑상설관 낭종

Thyroglossal duct cyst

The thyroglossal duct cyst is a developmental cyst arising from epithelial rests in the remnants of the thyroglossal duct produced by the descent of the thyroid gland. This cyst may be located anywhere in the neck midline from the foramen cecum to the thyroid gland, but about 70-80 per cent occur below the hyoid. Clinically, it is usually asymptomatic except painless swelling in the neck midline. But when it become infected, pain and sudden increase in size are occurred. Fistulas may occur spontaneously or secondary to trauma, infection, drainage or inadequate surgery. Histopathologically, the cyst or fistular tract may be lined by coiumnar, squamous, transitional or mixed-type epithelium. Occasionally, careful examination reveals ectopic thyroid tissue and mucus-secreting gland within the wall of a cyst or sinus tract. The extremely rare occurrence of squamous cell carcinoma arising from epithelial lining of a thyrog lossal duct cyst is documented. Because of relative high recurrence, the therapeutic ideal is removal of the entire tract, and for practical purpose this means removal of the central portion of the hyoid bone and core excision of the tongue tissue surrounding pioximal duct. This is a case of recurred thyroglossal duct cyst in neck midline of 11-year old male patient. He underwent the suigical excision of the central portion of the hyoid bone and remained thyroglossal tract. After 5 months of follow-up check, it revealed good healing and no recurrence at the operated site.