Grade | Size | Location | Bony changes |
---|---|---|---|
I | <10 mm | Intrapituitary | None |
II | >10 mm | Intrasellar or suprasellar expansion, no invasion | Sellar expansion |
III | Any | Intrasellar or suprasellar expansion, local invasion | Sellar erosion |
IV | >10 mm | Suprasellar expansion, invasion of extrasellar structures | Bone invasion |