Fig. 5From: Pituitary apoplexy: an update on clinical and imaging featuresAneurysm of the carotid siphon as shown on contrast-enhanced T1WI (a, arrows). Axial and coronal T2WI (b, c) show the presence of a hyperintense lesion with a peripheral hypointense rim. Contrast-enhanced MR angiography with 3D reconstruction (d) clearly shows the exact nature of the lesionBack to article page