This is a case report of a 22-year-old female whose tracheomalacia, caused by the long term respiratory management with cuffed tubes, was successfully treated with a Dumon stent. The patient was injured in a fall accident and suffered from severe cerebral contusion. She was intubated on admission and underwent tracheostomy on the 4th hospital day. Although we succeeded in treating her head injury, she suddenly became asphyxiated due to granulomas of the trachea where we concluded that the tip of the tracheostomy tube had scraped occasionally. We removed the tracheostomy tube and had to manage her under nasal tracheal intubation. Endoscopic examinations 30 days after re-intubation revealed a near-complete obstruction of the trachea during expiration located approximately 3-4cm above the carina. Endoscopic findings showed a typical crescent type tracheomalacia. Her trachea easily collapsed when the tracheal tube was withdrawn beyond the lesion. A Dumon stent was inserted into the collapsed lesion to avoid asphyxia. This airway management succeeded in preventing her airway collapse and she has been asymptomatic for 6 months. Judging from the lesion, tracheomalacia in this case seems to be associated with the long term management with an inflated cuff of a tracheal tube. The application of a Dumon stent to a focal tracheomalacia provides sufficient relief from airway collapse without the need for operative intervention.