Table 2. Comparison of imaging features between the benign and malignant lesions.
|
Imaging features |
Benign (n = 15) |
Malign (n = 9) |
Total (n = 24) |
P |
|
X-ray* | ||||
|
Abnormal opacity |
9 (81.8%) |
5 (62.5%) |
14 (73.7%) |
0.83 |
|
Asymmetrical lung opacity |
1a (9.1%) |
0 |
1 (5.3%) |
0.70 |
|
CT | ||||
|
Size (cm) (mean ± SD) |
6.7 ± 3.4 |
6 ± 2.3 |
6.4 ± 3 |
0.48 |
|
Multiplicity |
2 (13.3%) |
1 (11.1%) |
3 (12.5%) |
0.87 |
|
Lobulated margin |
9 (60%) |
6 (66.6%) |
15 (62.5%) |
0.74 |
|
Contrast enhancementb | ||||
|
Heterogeneous |
5 (45.4%) |
6 (75%) |
11 (57.9%) |
0.87 |
|
Homogeneous |
6 (54.5%) |
1 (12.5%) |
7 (36.8%) |
|
|
Calcification |
9 (60%) |
1 (11.1%) |
10 (41.7%) |
0.01 |
|
Atelectasis |
8 (53.3%) |
7 (77.8%) |
15 (62.5%) |
0.23 |
|
Pleural effusion |
8 (53.3%) |
3 (33.3%) |
11 (45.8%) |
0.34 |
|
Local invasion |
7 (46.6%) |
3 (33.3%) |
10 (41.7%) |
0.52 |
|
Lymphadenopathy |
4 (26.7%) |
2 (22.2%) |
6 (25%) |
0.81 |
|
Metastasis |
0 |
2 (22.2%) |
2 (8.3%) |
0.06 |
Numbers in brackets are column percentages. *No preoperative radiographs were available for four patients in the benign group and one patient in the malignant group. aAn asymmetric radiolucent hemithorax was present on the contralateral side of the mass. bTwo patients in the benign group and one patient in the malignant group did not have IV contrast studies. The mature cystic teratoma had a mildly enhancing solid nodule, and one pneumocytoma did not have apparent contrast enhancement. SD, standard deviation.