Differential diagnosis The differential of TO includes amyloidosis, which is typically circumferential, papillomatosis, though this usually occurs in younger patients and can cause lung cavitation when disseminated, granulomatosis with polyangiitis, though this is circumferential as well and often involves distal lung cavitation as well. Relapsing polychondritis can also spare the posterior wall, though it is not typically nodular in appearance.
Tracheobronchopathia osteochondroplastica
Bronchogenic cyst
Pancoast tumor
Vocal cord cyst
Nasopharyngeal angiofibroma
Scalp–ear–nipple syndrome
Tracheoinnominate fistula
Bronchial leiomyoma