声门下狭窄存在先天性和后天性两种基本形式。当3mm支气管镜(外径4.0×4.5mm)不能通过声门下腔时,即可诊断为先天性声门下狭窄。最常见的先天性喉缺陷中,声门下狭窄占第三位,仅次于喉软化和声带麻痹。后天性声门下狭窄(ASGS)可继发于炎症过程,但其最常见的病因为医源性损伤。90％婴幼儿 Subglottic stenosis there are two basic forms of congenital and acquired. When the 3mm bronchoscope (OD 4.0 × 4.5mm) can not pass through the subglottic, you can diagnose congenital subglottic stenosis. Of the most common congenital laryngeal defects, subglottic stenosis ranks third, behind laryngeal softening and vocal cord paralysis. Acquired subglottic stenosis (ASGS) can be secondary to the inflammatory process, but the most common cause is iatrogenic injury. 90% of infants