Aneurysma des Karotissiphon

Pituitary

apoplexy: an update on clinical and imaging features. Aneurysm 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 lesion