We recently treated a boy with inferior displacement of the larynx, caused by a shortened, fibrotic right sternothyroid muscle. Following division of the fibrotic muscle, the larynx ascended to a more normal position.
Since surgery, the patient's presenting symptom, hoarseness, has gradually regressed.
Stewart KC, Smith R, Tohme SM. LaryngoptosisAn Unusual Case of Hoarseness. Arch Otolaryngol. 1973;98(5):356–357. doi:10.1001/archotol.1973.00780020368018