*2.3. Radiographical Analysis*

The existence of CS invasion was evaluated by gadolinium (Gd)-enhanced T1-weighted images. We classified NF-PitNETs into two types: NF-PitNETs with CS invasion and NF-PitNETs without CS invasion. Cystic formation and hemorrhage components were evaluated using T1- or T2-weighted images. Tumor size was volumetrically measured via Gd-enhanced imaging, as previously described [20].
