Expanded Endoscopic Endonasal Approach to Anterior and Ventral Skull Base: An Evolving Paradigm

Table 2

The grading scheme for suprasellar extensions.

1: 0 to 10 mm suprasellar extension occupying the suprasellar cistern
2: 10 to 20 mm extension and elevation of the third ventricle
3: 20 to 30 mm extension occupying the anterior of the third ventricle
4: Larger than 30 mm extension, beyond the foramen of Munro or Grade C with lateral extension