Fig. 1

At diagnosis: Pre contrast sagittal T1-W image (a), post contrast sagittal T1-W image (b), and post contrast axial T1-W image (c) show a large lobulated avidly enhancing mass that fills and expands the sella, and extends to the suprasellar cistern (arrows). This mass is separated from the optic nerves and optic chiasm, and contacts the circle of Willis vessels, which preserve normal caliber. At completion of therapy: Pre contrast sagittal T1-W image (d), post contrast sagittal T1-W image (e), and post contrast axial T1-W image (f) show complete resolution of the sellar, suprasellar mass with no evidence of residual tumor, an empty sella (arrows), and normal surrounding structures