FIG 2. The case of a 40-year-old man who awoke with severe bilateral retro-orbital pain.

A, Axial contrast-enhanced CT scan shows a nonenhancing homogeneous intrasellar mass. No hemorrhage is seen.

B, Coronal spin-echo T1-weighted MR image (500/20 [TR/TE]) shows a nonhemorrhagic intrasellar mass with extension to the optic chiasm.

C, Coronal spin-echo T1-weighted MR image (500/20) shows minimal curvilinear marginal enhancement (arrow) after the administration of contrast medium (0.05 mmol/kg).

D, Tensor diffusion-weighted MR image (b = 1000 mm²/s) shows increased signal intensity (arrow) within the pituitary mass, compared with that in normal gray and white matter.

E, ADC map shows decreased signal intensity within the pituitary mass; mean ADC was 0.63 (10–3 mm²/s).