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Lesion characteristics in patients with subglottic stenosis
| Etiology | |
| Idiopathic | 39 (78%) |
| GPA | 1 (2%) |
| Positive autoimmune serology—ANCA-negative | 6 (12%) |
| Rheumatoid arthritis | 3 (5%) |
| Prolonged intubation | 1 (2%) |
| Intubation history within 2 years prior to diagnosis setting | |
| Positive | 13 (26%) |
| Negative | 37 (74%) |
| Cotton–Myer grade | |
| I | 7 (14%) |
| II | 29 (58%) |
| III | 14 (28%) |
GPA granulomatosis with polyangiitis, ANCA antineutrophil cytoplasmic antibodies
