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. 2016 Aug 9;11(8):e0160502. doi: 10.1371/journal.pone.0160502

Fig 1. Collateral status on dynamic 4D CTA as measured by collateral grading scale (CGS).

Fig 1

White arrow indicates the site of occlusion. Top two rows: a patient with a right MCA M1 segment occlusion and good collaterals as CGS score of 2: rLMC score on peak phase (rLMC-P) = 15, and rLMC score on tMIP (rLMC-M) = 18. Middle two rows: a patient with a right ICA occlusion and intermediate collaterals as CGS score of 1 (rLMC-P = 13 and rLMC-M = 15). Bottom two rows: a patient with a right ICA occlusion and poor collaterals as CGS score of 0 (rLMC-P = 3 and rLMC-M = 4).