Derived Grade
NAACCR Item
NAACCR #1975| Code | Description |
|---|---|
| 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 |