ICA bifurcation aneurysm

CT and MRI Brain with MR Angio

Non contrast CT Brain

MRI Brain Axial FLAIR

MR Angio Non contrast 3 D TOF

This non contrast CT study of brain shows hyper dense subarachnoid bleed in basal cisterns, sylvian fissures and bilateral hemispheric cortical sulci which is hyper intense on axial FLAIR Brain.
An associated mild to moderate hydrocephalus.
Non contrast 3 D TOF MR Angiogram of brain shows an Aneurysmal out pouching from right ICA at its bifurcation.

Internal carotid artery (ICA) bifurcation aneurysms are uncommon, little is known about its incidence, anatomical characteristics and results of endovascular treatment.
Equally distributed to the right and left side. When present on either side called Mirror aneurysms.