Fig. 1

Magnetic resonance imaging (MRI) scans from the first episode: a Enhanced sagittal T1 sequence: enlarged pituitary fossa with a lesion convex to the suprasellar area. The pituitary stalk was compressed. The size of the lesion was 43*15*17 mm, with a slightly long T1 and long T2 signal mixed with a short T1 signal and a long T2 signal with inhomogeneous enhancement. No obvious bone destruction was detected. b Enhanced coronal T1 sequence: optic chiasm compression with the bilateral cavernous sinus surrounded by the lesion. c Enhanced sagittal T1 sequence: the volume of the lesion was reduced significantly after IV glucocorticoid treatment. d Enhanced coronal T1 sequence: the morphology of the optic chiasm and cavernous sinus returned to normal after IV glucocorticoid administration