ICA Aneurysm

Bilateral ICA aneurysms MR Angio

This MRI study of Brain Axial T2w images shows:
A right para sellar and a left supra sellar ovoid well circumscribed lesions with T2 flow voids in relation of ICAs, show flow related signals on 3 D TOF Non contrast MR Angiography suggestive of a right ICA cavernous portion and a left ICA supra clinoid portion aneurysm. 

When unilateral ICA aneurysm seen equally distributed on either side. When involve bilateral ICA called mirror aneurysms.

ICA Aneurysm MR Angio

 
Axial T2 and FLAIR images at the level of sella show a solitary ovoid left parasellar well circumscribed lesion with mixed signals, show flow related signals on 3D TOF Noncontrast MR Angiography, as a saccular outpouching from left intra cranial ICA supraclinoid portion is a an Aneurym.
Mixed signals instead of flow void in the outpouching on T2w images may be due to its partial thrombosis.