Laryngeal web UMLS:C0281890 Laryngeal webs Manifestations may appear at any age (hoarse or weak voice and frequent upper respiratory infections) but onset usually occurs during infancy (respiratory distress, stridor and an unusual cry). Partial laryngeal atresia SNOMEDCT_US:297159008 HP:0005950 A membrane-like structure that extends across the laryngeal lumen close to the level of the vocal cords. Glottic web Abnormal larynx morphology