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Table 1: CTA findings in 29 patients with carotid blowout syndrome
Imaging Finding All CTA First CTA Second CTA
Necrosis 
    Percentage (ratio) 94% (31/33) 93% (27/29) 100% (4/4)
    95% CI 0.79–0.99 0.77–0.99 0.54–1.00
Viable perivascular tumor 
    Percentage (ratio) 67% (22/33) 66% (19/29) 75% (3/4)
    95% CI 0.50–0.80 0.47–0.80 0.29–0.97
Pseudoaneurysm 
    Percentage (ratio) 58% (19/33) 59% (17/29) 50% (2/4)
    95% CI 0.41–0.73 0.40–0.75 0.15–0.85
Contrast extravasation 
    Percentage (ratio) 30% (10/33) 24% (7/29) 75% (3/4)
    95% CI 0.17–0.47 0.12–0.42 0.29–0.97
Exposed artery 
    Percentage (ratio) 73% (24/33) 69% (20/29) 100% (4/4)
    95% CI 0.56–0.85 0.51–0.83 0.54–1.00

Imaging Finding	All CTA	First CTA	Second CTA
Necrosis
Percentage (ratio)	94% (31/33)	93% (27/29)	100% (4/4)
95% CI	0.79–0.99	0.77–0.99	0.54–1.00
Viable perivascular tumor
Percentage (ratio)	67% (22/33)	66% (19/29)	75% (3/4)
95% CI	0.50–0.80	0.47–0.80	0.29–0.97
Pseudoaneurysm
Percentage (ratio)	58% (19/33)	59% (17/29)	50% (2/4)
95% CI	0.41–0.73	0.40–0.75	0.15–0.85
Contrast extravasation
Percentage (ratio)	30% (10/33)	24% (7/29)	75% (3/4)
95% CI	0.17–0.47	0.12–0.42	0.29–0.97
Exposed artery
Percentage (ratio)	73% (24/33)	69% (20/29)	100% (4/4)
95% CI	0.56–0.85	0.51–0.83	0.54–1.00