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CT scan classification of thymus aspects
| 0 | 0 | Fatty thymus atrophy (the most common in middle aged adults) |
| A | 1 | Homogeneous non-fatty thymus (common in young adults) |
| 2 | Fat in the thymus area associated with micronodules | |
| 3 | Moderate infiltration of the thymus area | |
| B | 4 | Hyperplasia, marked infiltration, micronodules |
| 4 | Hyperplasia with well-defined contours | |
| 6 | Nodular hyperplasia without a tumour mass | |
| 7 | Pseudo-tumoral mass with well-defined contours |
