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Tracheomalacia (from ''trachea'' and the Greek μαλακία, ''softening'') is a condition characterized by flaccidity of the tracheal support cartilage which leads to tracheal collapse especially when increased airflow is demanded. The trachea normally dilates slightly during inspiration and narrows slightly during expiration. These processes are exaggerated in tracheomalacia, leading to airway collapse on expiration. The usual symptom of tracheomalacia is expiratory stridor or laryngeal crow. If the condition extends further to the bronchi (if there is also bronchomalacia), it is termed tracheobronchomalacia. The same condition can also affect the larynx, which is called laryngomalacia. ==Classification== There are three types: *Type 1 — congenital, sometimes associated with tracheoesophageal fistula or esophageal atresia *Type 2 — extrinsic compression sometimes due to vascular rings *Type 3 — acquired due to chronic infection or prolonged intubation or inflammatory conditions like relapsing polychondritis 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「tracheomalacia」の詳細全文を読む スポンサード リンク
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