Tracheomalacia (from trachea and the Greek µa?a??a, softening) is a condition characterized by flaccidity of the tracheal supportcartilage 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.
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http://ispub.com/ijs/19/2/9655 s balasubramanian, r kannan, k balakrishnan. post-operative tracheomalacia after surgery on the thyroid and the aero-digestive tract. the internet journal of surgery. 2008 volume 19 number 2.
http://jphmr.com/wp-content/uploads/2014/05/17.pdf case report on table extubation of a patient with tracheomalacia after thyroidectomy for large retrosternal goiter by smriti sinha, chakravarthy joel, varghese zachariah k j pub health med res 2014;2(1):58-60