Congenital hypoplasia of the internal carotid artery

Case contributed by Mohamed Saber


Incidental finding in the workup of cerebral hemorrhagic venous infarction.

Patient Data

Age: 45 years
Gender: Female

MRA shows the following:

  • markedly hypoplastic left internal carotid artery supplying the left ophthalmic artery
  • hypoplastic/aplastic A1 segment of the left ACA
  • the left posterior cerebral artery supplies the left middle cerebral artery via a large posterior communicating artery
  • normal appearance of the anterior and middle cerebral arteries
  • normal appearance of vertebrobasilar and posterior cerebral arteries

Case Discussion

Here is a case of congenital hypoplasia of the internal carotid artery, one of the forms of congenital absence of the internal carotid artery (ICA), a term that encompasses agenesis, aplasia, and hypoplasia.

Many of these cases remain asymptomatic and go undetected, however, it is occasionally associated with cerebral aneurysms.

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