Table 2.

Radiologic, and Histopathologic Tests

Variables	No. (%)
Chest CT, n (%)
Calcified nodules	10 (30.3)
Normal	23 (69.7)
Involved sites on bronchoscopy, n (%)
Entire trachea	21 (63.6)
Extending to both main bronchi	5 (15.2)
Extending to both main bronchi and involving lower bronchi	5 (15.2)
Partially involved only on the trachea	12 (36.4)
Involved upper trachea	3 (9.1)
Involved upper and middle trachea	3 (9.1)
Involved middle and lower trachea	4 (12.1)
Involved lower trachea	2 (6.1)
Bronchoscopic stage, n (%)
Stage I	8 (24.2)
Stage II	19 (57.6)
Stage III	6 (18.2)
Histopathologic findings, n (%)
Cartilaginous	15 (45.5)
Bony tissues	18 (54.5)
Squamous metaplasia	3 (9.1)