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Table 2: Angiographic Suzuki grade and presence of collaterals
Cerebral Hemispheres Studied n = 74
Suzuki stage 
    0 9 (12.2%)
    I 10 (13.5%)
    II 10 (13.5%)
    III 14 (18.9%)
    IV 15 (20.3%)
    V 5 (6.8%)
    VI 11 (14.9%)
OA–intracranial artery collaterals 35 (47.3%)
Rete mirabile of the OA 17 (23%)
Anterior ethmoidal artery–ACA branch direct collaterals 15 (20.3%)
Anterior ethmoidal artery–ACA branch collaterals via anterior falcine artery 23 (31.1%)
Posterior ethmoidal artery–orbitofrontal artery 16 (21.6%)
Recurrent meningeal artery–MMA–Sylvian branch 1 (1.4%)
Collaterals 
    Leptomeningeal collaterals to ACA territory 51 (68.9%)
    Duro-pial collaterals to ACA territory 5 (6.8%)
    Posterior callosal artery collateral 22 (29.7%)
    Periventricular collaterals 47 (63.5%)
Note:—MMA indicates middle meningeal artery.

Cerebral Hemispheres Studied	n = 74
Suzuki stage
0	9 (12.2%)
I	10 (13.5%)
II	10 (13.5%)
III	14 (18.9%)
IV	15 (20.3%)
V	5 (6.8%)
VI	11 (14.9%)
OA–intracranial artery collaterals	35 (47.3%)
Rete mirabile of the OA	17 (23%)
Anterior ethmoidal artery–ACA branch direct collaterals	15 (20.3%)
Anterior ethmoidal artery–ACA branch collaterals via anterior falcine artery	23 (31.1%)
Posterior ethmoidal artery–orbitofrontal artery	16 (21.6%)
Recurrent meningeal artery–MMA–Sylvian branch	1 (1.4%)
Collaterals
Leptomeningeal collaterals to ACA territory	51 (68.9%)
Duro-pial collaterals to ACA territory	5 (6.8%)
Posterior callosal artery collateral	22 (29.7%)
Periventricular collaterals	47 (63.5%)