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Final diagnosis of CEUS group and US group after biopsy
| Characteristics | Case No. | |
| CEUS group (N=64) | US group (N=51) | |
| Malignant | 46 | 34 |
| Lymphoma | 23 | 10 |
| Thymic carcinoma | 16 | 12 |
| Malignant thymoma | 4 | 7 |
| Neuroendocrine carcinoma | 2 | 1 |
| Seminoma | 1 | 1 |
| Metastatic carcinoma | 0 | 2 |
| Malignant mesothelioma | 0 | 1 |
| Benign | 18 | 17 |
| Benign thymoma | 10 | 8 |
| Teratoma | 3 | 3 |
| Nodular goiter | 3 | 3 |
| Fibrous mediastinitis | 2 | 3 |
