Legend The left middle cerebral artery is hyperdense on these axial noncontrast CT images. The temporal horn and Sylvian fissure are patent with no evidence of mass effect on these images.

Legend The borders of the left external capsule are indistinct as compared to the right consistent with early edema.

Legend There is now decreased attenuation in the left frontotemporal region with effacement of the Sylvian fissure. The left middle cerebral artery continues to be hyperdense.

Legend More rostral images demonstrate extensive edema in left middle cerebral artery distribution. Key words: stroke vascular

Brain Diagnosis: Middle cerebral artery embolus with cerebral infarction