Features
- Prevalence: 15% to 19% in previously intubated patients; of these, 1% to 5% are symptomatic
- Etiology: Mucosal damage from pressure or infection
- Morphology: Cicatricial stenosis, with or without malacia, granulation tissue
- Location: Cervical, midtrachea, subglottis
- Extent: Usually 1 to 4 cm
Image: Multilevel complex PITS (arrow) seen on virtual bronchography (A). Fixed upper airway obstruction pattern on flow volume loop (arrow) seen with fibrotic PITS (B).