Lesion Characteristics
| Characteristic | Value |
|---|---|
| Location (n) | |
| Mediastinum (malignant/benign) | 118 (71/47) |
| Hilum (malignant/benign) | 19 (11/8) |
| Mean size (±SD) (mm) | |
| Malignant | 18.4 ± 6.2 |
| Benign | 13.9 ± 3.1 |
| Histopathologic type (n) | |
| Malignant | |
| Adenocarcinoma | 35 |
| Squamous cell carcinoma | 31 |
| Unclassified non–small cell lung cancer | 2 |
| Adenosquamous cell carcinoma | 1 |
| Small cell carcinoma | 6 |
| Malignant lymphoma | 6 |
| Melanoma | 1 |
| Benign (n) | |
| Granulomatous inflammation | 26 |
| Anthracosis | 23 |
| Follicular hyperplasia | 2 |
| Follicular hyperplasia and anthracosis | 1 |
| Nonspecific inflammation | 3 |
| Method of diagnosis (n) | |
| Surgery or mediastinoscopy (malignant/benign) | 56 (19/37) |
| Transbronchial needle aspiration (malignant/benign) | 81 (63/18) |