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Abstract
Bilateral internal carotid artery agenesis is a rare lesion, with only 18 cases previously
reported. Blood supply to the anterior cerebral circulation is most commonly through
enlarged basilar and posterior communicating arteries. Occasionally collateral flow
is through abnormal transsellar anastomoses or anastomoses between the external carotid
and intracranial systems. Associated intracranial aneurysms occur in 25% of patients,
accounting for a significant incidence of intracranial hemorrhage as the initial symptom.
Diagnosis is best made by cerebral arteriography with computed tomography to verify
the congenital nature of the abnormality by demonstrating the absence of carotid canals.
This is the second case to begin with transient ischemic attacks suggestive of carotid
territory ischemia but originating from the vertebral system. Angiographic findings
included absent internal carotid arteries, small common carotid arteries, and bilateral
high-grade stenoses at the origins of large vertebral arteries. This is the first
such case to be treated with reimplantation of the vertebral artery with resolution
of symptoms.
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Article info
Publication history
Accepted:
November 14,
1991
Identification
Copyright
© 1993 Published by Elsevier Inc.
