Suster and Moran classification of thymic epithelial neoplasms
| Tumour type | Grading | Histological criteria |
|---|---|---|
| Reprinted with permission from Suster and Moran.17 | ||
| Thymoma | Well differentiated | Preservation of organotypical features of thymic differentiation; no cytological evidence of atypia |
| Atypical thymoma | Moderately differentiated | Partial preservation of organotypical features of differentiation; mild to moderate cytological atypia |
| Thymic carcinoma | Poorly differentiated | Loss of organotypical features of differentiation; presence of overt cytological evidence of malignancy |