<unk>  or<unk>  is a condition characterized by flaccidity of the tracheal support cartilage which leads to tracheal collapse. This condition can also affect the bronchi. There are two forms of this condition: primary<unk>  and secondary<unk> . Primary<unk>  is congenital and starts as early as birth. It is mainly linked to genetic causes. Secondary<unk>  is acquired and starts in adulthood. It is mainly developed after an accident or chronic inflammation.<unk>  may also occur in people who have normal cartliginous structure of the trachea, but significant atrophy of the posterior wall, causing significant invagination of the trachea on expiration. In these cases it is more commonly known as Excessive Dynamic Airway Collapse (EDAC).
Tracheobronchomalacia
Chronic obstructive pulmonary disease
Bronchomalacia
Bronchiectasis
Tracheomalacia
Lung cancer
Tracheal tumor
Asthma