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Hypodense area in left side of pons, in keeping with acute pontine infarct.
Hyperdense basilar artery.
Bifrontal subcortical leukoaraiosis.
The CT angiogram confirms a thrombus in the basilar artery.
The thin right vertebral artery is invisible distal to the origin of the right PICA.
The intracranial portion of the left vertebral artery (V4) is hypodense in comparison to other arteries.