Axial CT scans. Note the metal fragment (bright signal) near the midline (left upper image). In the remaining scans, note the hypodensity in the distribution of the anterior cerebral artery. As the ...

Posterior Cerebral Artery (PCA) Infarction: Flair axial MRIs. Note the bright signal in the distribution of the right posterior cerebral artery. If one looks closely, one can also see a small infarct ...

WE have recently studied 2 patients with symptoms of cerebral ischemia in whom a reversal of blood flow through the left vertebral artery was demonstrated. In both cases the anatomic lesion produci ...