Fig. 1

Pituitary magnetic resonance imaging (MRI) at diagnosis. A Thin coronal T2-weighted slice showing a normal pituitary gland (arrow); B Contrast-enhanced (CE) thin coronal T1-weighted slice in similar location as Fig. 1A, failing to reveal any abnormality in the pituitary gland; C Pre-contrast thin mid-sagittal T1-weighted slice showing normal anterior and posterior pituitary lobes (thin arrow) and a polypoid-like mass on the posterior wall of the sphenoid sinus, clearly distant from the sellar region and first considered as a benign naso-sinusal polyp (thick arrow)