Figure 1

Noninvasive imaging. (A) Three-dimensional 360-slice CTA of the head of a 63-year-old woman presenting with headaches after a motor vehicle collision demonstrating a right M1 dissection with pseudoaneurysm immediately before the bifurcation (arrow); there is normal caliber of the contralateral MCA. (B) MRI brain shows diffusion restriction within the right perisylvian region consistent with acute ischemia. She was discharged on antiplatelet therapy with a modified Rankin Scale score of 0.