The modified edition (V grades) is shown below:

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Extension

Suprasellar extension 0: none A: expanding into suprasellar cistern B: anterior recesses of 3rd ventricle obliterated C: floor of 3rd ventricle grossly displaced

Parasellar extension D*: intracranial (intradural) E: into or beneath cavernous sinus (extradural)

Invasion/Spread

Floor of sella intact I: sella normal or focally expanded; tumor < 10 mm II: sella enlarged; tumor ≧ 10 mm

Sphenoid extension III: localized perforation of sellar floor IV: diffuse destruction of sellar floor

Distant spread V: spread via CSF or blood-borne

* Specify: 1) anterior, 2) middle, 3) posterior fossa.