17 May 2011

Anterior Choroidal Artery Infarct

Non-enhanced CT showing hypodense region with local edema involving basal parts of the left temporal lobe including parahippocampal gyrus. This most likely represents selective subacute infarct in the Anterior Choroidal Artery (AChA) branch. AChA originates from Internal Carotid Artery just above the Posterior Communicating Artery (PCom). It usually supplies choroid plexus, optic tracts, temporal horn, cerebral peduncle, part of thalamus and posterior limb of internal capsule. There are also Lateral and Middle Posterior Choroidal Arteries that originate form the P2 segment of the Posterior Cerebral Artery (PCA) and provide complimentary blood supply. Those vascular territories although with many anatomical variants are important in differentiating such selective stroke from other pathologies such as for example Herpes Encephalitis that has predilection for the limbic system.