Table 1 Diagnostic criteria for cerebral artery dissection

Definite case

Satisfying any of diagnostic criteria I, II, or III below

 I.

Either intimal flap or double lumen visible on cerebral angiogram

 II.

Either intimal flap or double lumen visible on MRI or MRA (tomogram image). Handled identically if the transverse image on 3D-CTA and ultrasound examination is sufficiently delineated, and a clear intimal flap and double lumen are visible

 III.

If any of findings IV, V, or VI are seen, and a clear change is seen in the findings over time with repeated imaging examinations. Limited to cases in which a cause other than dissection can be ruled out

Suspected case

Satisfying any of diagnostic criteria IV, V, or VI below

 IV.

Non-specific findings suggesting arterial dissection (pearl sign, tapered occlusion) are visible on cerebral angiogram other than the findings in I above

 V.

Findings are visible on MRA angiogram that appear to correspond to the pearl and string sign, string sign, or tapered occlusion on cerebral angiogram

 VI.

Intense signal suggesting intramural hematoma visible on MRI T1-weighted image