| 1 |
G1: Nucleoli absent or inconspicuous and basophilic at 400x magnification
Stated as WHO/ISUP Grade 1 |
| 2 |
G2: Nucleoli conspicuous and eosinophilic at 400x magnification, visible but not prominent at 100x magnification
Stated as WHO/ISUP Grade 2 |
| 3 |
G3: Nucleoli conspicuous and eosinophilic at 100x magnification
Stated as WHO/ISUP Grade 3 |
| 4 |
G4: Marked nuclear pleomorphism and/or multinucleate giant cells and/or rhabdoid and/or sarcomatoid differentiation
Stated as WHO/ISUP Grade 4 |
| A |
Well differentiated |
| B |
Moderately differentiated |
| C |
Poorly differentiated |
| D |
Undifferentiated, anaplastic |
| 9 |
Grade cannot be assessed (GX); Unknown
Only Fuhrman grade documented |
