C — Caudate Nucleus

Normal — No early ischemic change in caudate+0Abnormal — Early ischemic change present in caudate (subtract 1)-1

L — Lentiform Nucleus (Putamen + Globus Pallidus)

Normal — No early ischemic change in lentiform nucleus+0Abnormal — Early ischemic change present in lentiform nucleus (subtract 1)-1

IC — Internal Capsule (Posterior Limb)

Normal — No early ischemic change in internal capsule+0Abnormal — Early ischemic change present in internal capsule (subtract 1)-1

I — Insular Ribbon

Normal — Insular ribbon preserved; no gray-white loss+0Abnormal — Insular ribbon sign present (hypodensity/gray-white loss) (subtract 1)-1

M1 — Anterior MCA Cortex

Normal — No early ischemic change in M1+0Abnormal — Early ischemic change in M1 (subtract 1)-1

M2 — MCA Cortex Lateral to Insula

Normal — No early ischemic change in M2+0Abnormal — Early ischemic change in M2 (subtract 1)-1

M3 — Posterior MCA Cortex

Normal — No early ischemic change in M3+0Abnormal — Early ischemic change in M3 (subtract 1)-1

M4 — Anterior Superior MCA Cortex

Normal — No early ischemic change in M4+0Abnormal — Early ischemic change in M4 (subtract 1)-1

M5 — Lateral Superior MCA Cortex

Normal — No early ischemic change in M5+0Abnormal — Early ischemic change in M5 (subtract 1)-1

M6 — Posterior Superior MCA Cortex

Normal — No early ischemic change in M6+0Abnormal — Early ischemic change in M6 (subtract 1)-1

ASPECTS — Alberta Stroke Program Early CT Score