Magnetic resonance images of the patient on admission. (a) Axial T2-weighted image showing a tumor located in supra-sellar region (arrow). The tumor is imaged as same intensity as gray matter. (b) Arterial spin labeling (ASL) perfusion weighted image corresponding to the section of (a). The tumor is revealed as bright hyper-intensity mass (arrow), suggesting elevated blood flow. (c) Sagittal T1-weighted pre-contrast image. The tumor is located in pituitary fossa and had spread across the suprasellar region (arrows). (d) ASL fusion image onto a T2-weighted image. The fusion image demonstrates high blood flow signal exactly corresponds to the tumor mass (arrows).