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Table 2 Anatomic severity grading scoring system

From: A novel anatomic severity grading score for acute Type B aortic dissections and correlation to aortic reinterventions after thoracic endovascular aortic repair

  Attribute 0 1 2 3
Proximal Landing Zone Whole lumen cross-sectional area contour change (CC1) <200 mm2 200 - 450 mm2 450 - 700 mm2 >700 mm2
Maximum whole lumen cross-sectional area (mCSA1) <1000 mm2 1000 - 1100 mm2 1100 - 1400 mm2 >1400 mm2
Left common carotid to left subclavian distance (L1) >18 mm 18 - 12 mm <12 mm  
Left common carotid to entry tear distance (L2) >100 mm 100 - 25 mm <25 mm  
Calcification and thrombus index (CT) <0.3 0.3 - 0.5 >0.5  
Curvature and Tortuosity Thoracic aorta tortuosity index (TT) <1.25 1.25 - 1.35 >1.35  
Intraaortic distance (ID) >28 mm 28 - 23 mm <23 mm  
Arch type Type I Type II Type III  
Dissection False lumen cross-sectional area index (FCI) <0.2 0.2 - 0.5 0.5 - 0.65 >0.65
False lumen length (FLL) <300 mm   >300 mm  
Tear length <5 mm 5 - 17 mm >17 mm  
Number of observable tears 0 >0   
Tear circumferential location Not at outer curvature of arch At outer curvature of arch   
Branch Vessels Location (BVL) 0 1 - 3 4 >4
Patency (BVP) 0 1 - 2 >2  
Supraceliac Aorta Anatomy Whole lumen cross-sectional area contour change (CC2) <300 mm2 300 - 400 mm2 400 - 600 mm2 >600 mm2
Maximum whole lumen cross-sectional area (mCSA2) <650 mm2 650 - 850 mm2 850 - 925 mm2 >925 mm2