1,2 Ji Hoon Noh

1Samsung Medical Center, 2Seoul Veterans Hospital


Congenital absence of the bilateral internal carotid arteries (ICA) is a very rare occurrence.

Material(s) and Method(s):

Brain magnetic resonance angiography (MRA), tranfemoral cerebral angiography, carotid MRA, brain computed tomography (CT), 99mTc-ECD SPECT and perfusion MRI were performed.


Absence of the ICA may be associated with aneurysms of 24%-34%, compared to a 2%-4% prevalence observed in the general population. In many reported cases, the anterior communicating artery (ACOM) is the most common location of aneurysms.


Recognition of absence of the bilateral internal carotid arteries (ICA) is important, when considering intracranial endovascular interventions in the event of thromboembolic events with revascularization, transsphenoidal surgery, and the surveillance and detection of associated cerebral aneurysms.