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

Table 1

The radiological classification for pituitary adenomas.

0: Normal pituitary appearance
1: Enclosed within the sella turcica, microadenoma smaller than 10 mm
2: Enclosed within the sella turcica, macroadenoma 10 mm or larger
3: Invasive locally into the sella
4: Invasive diffusely into the sella