Table 2. Patient characteristics and CT findings in TETs.
| Patient characteristics and CT findings | Masaoka-Koga clinical stage |
P value | |||
|---|---|---|---|---|---|
| I (n=63) | II (n=32) | III (n=32) | IV (n=11) | ||
| Gender (male/female) | 31/32 | 14/18 | 18/14 | 7/4 | NS* |
| Myasthenia gravis (yes/no) | 10/53 | 5/27 | 3/29 | 0/11 | NS* |
| Age (mean value, years) | 53.2 | 58.6 | 52.6 | 50.9 | NS** |
| Size (mean value, cm) | |||||
| X-axis diameter | 5.5 | 4.5 | 6.6 | 5.1 | 0.005** |
| Y-axis diameter | 3.8 | 3 | 4.4 | 3 | 0.004** |
| Z-axis diameter | 6.4 | 4.7 | 7.1 | 5.9 | 0.005** |
| Shape (round/lobulated/irregular) | 29/29/5 | 10/16/16 | 4/7/21 | 2/3/6 | 0.000* |
| Contour (smooth/partial smooth/unsmooth) | 31/31/1 | 6/24/2 | 0/21/11 | 1/6/4 | 0.000* |
| Internal density (homogeneous/heterogeneous) | 33/30 | 16/16 | 9/23 | 3/8 | NS* |
| Enhancement pattern (homogeneous/heterogeneous) | 15/48 | 8/24 | 1/31 | 3/8 | 0.041* |
| Calcification (yes/no) | 12/51 | 8/24 | 8/24 | 3/8 | NS* |
| Infiltration of surrounding fat (yes/no) | 29/34 | 29/3 | 29/3 | 11/0 | 0.000* |
| Invasion of mediastinal pleura (yes/no) | 24/39 | 15/17 | 29/3 | 9/2 | 0.000* |
| Invasion of lung (yes/no) | 7/56 | 1/31 | 22/10 | 7/4 | 0.000* |
| Invasion of pericardium (yes/no) | 4/59 | 2/30 | 22/10 | 5/6 | 0.000* |
| Invasion of great vessels (yes/no) | 4/59 | 0/32 | 15/17 | 6/5 | 0.000* |
| Invasion of phrenic nerve or elevated hemidiaphragm (yes/no) | 1/62 | 1/31 | 11/21 | 3/8 | 0.000* |
| Presence pleural effusion (yes/no) | 2/61 | 1/31 | 2/30 | 3/8 | 0.000* |
| Mediastinal lymph node enlargement (yes/no) | 0/63 | 0/32 | 1/31 | 1/10 | NS* |
| Pleura and/or pulmonary nodule (yes/no) | 0/63 | 0/32 | 0/32 | 5/6 | 0.000* |
NS, not significant; *, P values were calculated using the chi-square test or the Fisher exact test for categorical variables; **, P values were calculated using the Mann-Whitney U test for continuous variables; CT, computed tomography; TET, thymic epithelial tumor.