Comparison of Various CT Findings According to Simplified Subgroups of Thymic Epithelial Tumors
| Simplified subgroups of WHO classification | |||
|---|---|---|---|
| CT finding | Low-risk thymoma (n = 8) | High-risk thymoma (n = 9) | Thymic carcinoma (n = 16) |
| Contour* | |||
| Smooth | 6 | 4 | 2 |
| Lobulated | 2 | 3 | 5 |
| Irregular | 0 | 2 | 9 |
| Necrosis | |||
| Absence | 1 | 2 | 0 |
| Presence | 7 | 7 | 16 |
| Calcification | 1 | 6 | 4 |
| Enhancement pattern | |||
| Homogeneous | 2 | 2 | 0 |
| Heterogeneous | 6 | 7 | 16 |
| Enhancement degree | |||
| Less | 0 | 1 | 0 |
| Equal | 2 | 5 | 4 |
| More | 6 | 3 | 12 |
| Mediastinal fat infiltration† | 1 | 7 | 16 |
| Great vessel invasion | 0 | 1 | 1 |
| Pleural effusion | 1 | 1 | 0 |
| Pericardial effusion | 0 | 0 | 1 |
| Pleural seeding | 2 | 3 | 2 |
| Lymph node | 0 | 0 | 5 |