Tracheobronchopathia osteochondroplastica

Findings include osteocartilaginous nodules within the submucosa of trachea - arises from the cartilage (anterior) component of the trachea, not the posterior membrane

Differential diagnosis of multiple tracheal polypoid lesions:
-relapsing polychondritis
-metastatic disease

Single lesions:
- mucoepidermoid
- adenoid cystic carcinoma
- squamous cell carcinoma
- carcinoid
- hamartoma