Table 3. Computed Tomography Characteristics of Benign vs Malignant Lesions.
| Characteristic | No. (%) | P value | |
|---|---|---|---|
| Benign (n = 31) | Malignant (n = 9) | ||
| Anatomic location | |||
| Right | |||
| Upper lobe | 8 (26) | 3 (33) | >.99 |
| Middle lobe | 4 (13) | 0 | .56 |
| Lower lobe | 12 (39) | 1 (11) | .13 |
| Left | |||
| Upper lobe | 4 (13) | 5 (56) | .03a |
| Lower lobe | 8 (26) | 2 (22) | >.99 |
| Laterality | |||
| Right | 20 (65) | 3 (33) | .13 |
| Left | 9 (29) | 5 (56) | .23 |
| Bilateral | 2 (7) | 1 (11) | .55 |
| Maximum cyst size, mean (SD), cm | 6.3 (2.8) | 6.9 (3.4) | .10 |
| Solid portion | 11 (36) | 5 (56) | .44 |
| Cyst characteristics | |||
| Macrocystic (>1 cm) | 20 (65) | 9 (100) | .04a |
| Microcystic (<1 cm) | 2 (7) | 0 | >.99 |
| Midline shift | 14 (45) | 4 (44) | >.99 |
| Pneumothorax | 0 | 1 (11) | .23 |
| Pleural effusion | 3 (10) | 2 (22) | .31 |
| Septations | 15 (48) | 8 (89) | .05 |
| Chest wall invasion | 1 (3) | 0 | >.99 |
| Mediastinal lymph nodes | 3 (10) | 1 (11) | >.99 |
a
P < .05 (Fisher exact or t test).