Figure 1
Sagittal non-enhanced CT image showing a spontaneously well circumscribed hyperdense suprasellar mass (asterisk) near the optic chiasm (arrow). The pituitary gland is not involved (open arrow).
Figure 2
Sagittal T1-weighted MR images before (A) and after (B) gadolinium administration demonstrating a somewhat inhomogeneous aspect with moderate to intense enhancement of the tumor. Axial flair (C) and coronal T2-weighted (D) images showing the occupation of the opto-chiasmatic cistern and the low signal intensity to gray matter of the lesion. Diffusion-weighted image (E) demonstrating a slight hypointensity with ADC value estimated at 0.70 × 10−3 mm2/s (F)(circle).
Figure 3
Tumor constituted of polygonal cells presenting a granular cytoplasm and bland ovoid nuclei (arrow). PAS (diastase digestion) reveals the positivity of the cytoplasmic granules (asterisk).