Internal carotid artery hypoplasia

Case contributed by Dr Abdulmajid Bawazeer

Presentation

The patient came with a persistent headache and normal motor and sensory function.

Patient Data

Age: 40 years
Gender: Female

There is evidence of hypoplasia of the right internal carotid artery from its origin with small right carotid canal diameter in comparison with the contralateral side and prominent right posterior communicating artery.

The left posterior communicating artery is prominent and left segment P1 of left PCA appear hypoplastic.

There is evidence of hypoplasia of the right internal carotid artery from its origin with small right carotid canal diameter in comparison with the contralateral side and prominent right posterior communicating artery.

The left posterior communicating artery is prominent and left segment P1 of left PCA appear hypoplastic.

Annotated image

Annotated images for clarification of the findings.

On 3D images, the arrows point the site of the right internal carotid artery and fetal posterior communicating posterior cerebral artery.

Case Discussion

Congenital absence of the internal carotid artery (ICA) is a rare anomaly that occurs in less than 0.01% of the population. It encompasses agenesis, aplasia, and hypoplasia.

The diameter of the right carotid canal is smaller than the contralateral side which supports the diagnosis.

Collateral flow through the circle of Willis mainly from the right posterior communicating artery, as in this case, is the most common type.

A left fetal communicating posterior cerebral artery is noted (normal variant).

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Case information

rID: 62950
Published: 16th Sep 2018
Last edited: 14th Aug 2019
System: Vascular
Inclusion in quiz mode: Included

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