ABSTRACT
Stridor refers to the abnormal noisy breathing that occurs due to turbulent airflow passing through the narrow lumen of a partially obstructed airway. Stridor can be classified as inspiratory, expiratory, or biphasic. There are many causes for stridor in a newborn. These can be classified either by location or by the type of disorder causing the airway obstruction. Laryngomalacia is the most common cause of stridor in neonates. It is usually caused by an immature neuromuscular tone and/or weak and immature cartilages of the larynx. Congenital laryngeal cysts are rare findings in an infant. When they occur, the infant usually presents with upper airway obstructive symptoms. They can be extralaryngeal or endolaryngeal. Glottic stenosis is defined as a narrowing of the lumen at the level of the vocal folds. Intrinsic tracheal anomalies are disorders involving the maturity of the tracheal cartilages, narrowed lumen due to complete tracheal rings, atresia, or webs.
