Male, 12 days old, with left frontal encephalomalacia, IUGR. The ICAs demonstrate relatively normal and symmetric caliber. The right A1 segment is not visualized and may be congenitally hypoplastic or absent. The ACAs and MCAs are visualized to approximately the level of the third order branches and are free of significant focal stenosis or occlusion. Beyond this point, image quality does not permit accurate assessment. The vertebrobasilar system appears within normal limits. The PCAs are not well visualized but this is felt to be technical in nature.
The proximal intracranial vessels demonstrate a relatively normal and symmetric caliber. The more distal vessels also appear relatively normal to the level of the third order branches. Beyond this point, image quality does not allow for accurate assessment.