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DOI:10.2214/AJR.06.0991
AJR 2007; 188:W395
© American Roentgen Ray Society

Anatomic Variant of the Posterior Cerebral Artery

Ketan R. Bulsara, Ali Zomorodi and James M. Provenzale

Duke University Medical Center, Durham, NC



 
WEB-This is a Web exclusive article.

The embryologic development of the intracranial circulation is truly one of nature's marvels. Recognition of anatomic variants is increasingly important because this anatomic information may be needed during neurointerventional procedures.


Figure 1
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  		Fig. 1A —Multiple angiographic views depict duplication of posterior cerebral arteries in 35-year-old woman. Lateral projection of left internal carotid artery shows "fetal" posterior cerebral artery.

 


Figure 2
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  		Fig. 1B —Multiple angiographic views depict duplication of posterior cerebral arteries in 35-year-old woman. Anteroposterior projection from same left internal carotid angiogram depicted in A shows opacification of artery supplying internal occipital territory of posterior cerebral artery.

 


Figure 3
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  		Fig. 1C —Multiple angiographic views depict duplication of posterior cerebral arteries in 35-year-old woman. Vertebral artery injection shows second left posterior cerebral artery (small arrow), which gives rise to posterior temporal artery (large arrow).

 
In the most common form, paired posterior cerebral arteries originate from the apex of the basilar artery and course posteriorly and laterally to supply the medial and inferior occipital lobe and the posterior inferior temporal lobe. To our knowledge, we angiographically show a previously unreported anatomic variant of the posterior cerebral artery (Fig. 1A, 1B, 1C). In this variant, the internal carotid artery gives rise to a "fetal" posterior cerebral artery from which the internal occipital artery and its branches, the calcarine artery, parietooccipital artery, and the posterior pericallosal artery, arise. A duplication of the posterior cerebral artery arises from the basilar artery. This duplicated artery predominantly gives rise to the posterior temporal branch of the posterior cerebral artery.


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This Article
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Right arrow Articles by Provenzale, J. M.
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