Fetal posterior cerebral artery

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Fetal ~~PCOM~~posterior communicating cerebral artery

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A~~fetal PCOM~~ or fetal ~~origin~~ (origin of the) posterior cerebral artery is a very common variant in theposterior cerebral circulation~~. It is~~, estimated to occur in up to 30% of individuals. ~~The~~

The posterior communicating artery (PCOM) is larger than the P1 segment of theposterior cerebral artery (PCA) and supplies the bulk of the blood to the PCA. If bilateral, thebasilar artery is significantly smaller than normal.

The term is typically used to refer to the situation where the PCOM is larger than the P1. However, variation in usage abounds.

The P1 can be small (hypoplastic) or absent. The significance is in the stroke pattern, as the PCA is therefore part of the anterior circulation. Additionally a larger PCOM (with P1 present) allows for collateral circulation.

In case of non fetal PCA, the PCOM lies superomedial to the occulomotor nerve, whereas in case of fetal PCA, it lies superior or superolateral to the occulomotor nerve.

-A fetal PCOM or fetal origin of the posterior cerebral artery is a very common variant in the <a href="/articles/posterior-cerebral-circulation">posterior cerebral circulation</a>. It is estimated to occur in up to 30% individuals. The <a href="/articles/posterior-communicating-artery">posterior communicating artery (PCOM)</a> is larger than the P1 segment of the <a href="/articles/posterior-cerebral-artery">posterior cerebral artery (PCA)</a> and supplies the bulk of the blood to the PCA. If bilateral, the <a href="/articles/basilar-artery">basilar artery</a> is significantly smaller than normal. The term is typically used to refer to the situation where the PCOM is larger than the P1. However, variation in usage abounds.The P1 can be small (hypoplastic) or absent. The significance is in the stroke pattern, as the PCA is therefore part of the anterior circulation. Additionally a larger PCOM (with P1 present) allows for collateral circulation.In case of non fetal PCA, the PCOM lies superomedial to the <a href="/articles/cranial-nerves">occulomotor nerve</a>, whereas in case of fetal PCA, it lies superior or superolateral to the <a href="/articles/cranial-nerves">occulomotor nerve.</a>
+A fetal (origin of the) posterior cerebral artery is a very common variant in the <a href="/articles/posterior-cerebral-circulation">posterior cerebral circulation</a>, estimated to occur in up to 30% of individuals.The <a href="/articles/posterior-communicating-artery">posterior communicating artery (PCOM)</a> is larger than the P1 segment of the <a href="/articles/posterior-cerebral-artery">posterior cerebral artery (PCA)</a> and supplies the bulk of the blood to the PCA. If bilateral, the <a href="/articles/basilar-artery">basilar artery</a> is significantly smaller than normal. The term is typically used to refer to the situation where the PCOM is larger than the P1. However, variation in usage abounds.The P1 can be small (hypoplastic) or absent. The significance is in the stroke pattern, as the PCA is therefore part of the anterior circulation. Additionally a larger PCOM (with P1 present) allows for collateral circulation.In case of non fetal PCA, the PCOM lies superomedial to the <a href="/articles/cranial-nerves">occulomotor nerve</a>, whereas in case of fetal PCA, it lies superior or superolateral to the <a href="/articles/cranial-nerves">occulomotor nerve.</a>

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Fetal posterior cerebral artery

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