Fig. 1

Pituitary magnetic resonance imaging performed at diagnosis. a Unenhanced coronal T1-weighted view showing low-intermediate signal intensity of the anterior pituitary gland (arrow) as compared to normal tissue. b Coronal T2-weighted view showing significantly decreased signal intensity of the anterior pituitary gland (arrow) when compared to normal. c Early coronal T1-weighted view after intravenous bolus contrast injection showing diffusely decreased enhancement of the pituitary gland (arrow). d Unenhanced sagittal T1-weighted view showing a small anterior pituitary gland of low-intermediate signal intensity, a normal posterior lobe displaying typical hyperintense signal (thin arrow), which should not be confused with the very bright signal of fatty bone marrow in the dorsum sellae (larger arrow). The pituitary stalk is normal