NCIt definition : A congenital or acquired abnormality of the wall of the trachea. In congenital cases,
there is lack of rigidity in the cartilage of the tracheal wall. In acquired cases,
the cartilage of the tracheal wall is degenerated, secondary to tracheostomy or prolonged
presence of a breathing tube, or as a complication of a tracheoesophageal fistula
surgical repair. Symptoms include stridor, noisy breathing, and upper respiratory
infections.;