Persistent limbic arch

Last revised by Frank Gaillard on 25 Nov 2022

A persistent limbic arch (or ring) is a cerebral vascular anatomical variant whereby a complete vascular ring encircles the limbic system and corpus callosum.

In the embryo, this connection is between the anterior choroidal artery and the anterior cerebral artery (via pericallosal artery) 2. This usually regresses and in the adult, the anterior and posterior supply are separated by an intervening pial capillary network on the superior surface of the posterior corpus callosum 1,2.

Occasionally persistent direct a large-caliber anastomosis is identified in adults, divided into two types 2:

These anastomoses are also important in various disease states including vein of Galen malformations 1 and moyamoya disease 2.

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