Table 5.

Comparisons of follow-up features between progressive enlargement and non-progressive aneurysmal dilatation.

	Progressive enlargement of aneurysmal dilatation (n = 4)	Non-progressive aneurysmal dilatation (n = 4)	P
Time to MRI from symptom onset, days	216 (196–231)	182.0 (157–193.5)	0.083
Male	3 (75)	2 (50)	1.000
Age, years	48.5 (46–53.5)	42.5 (39–50.5)	0.245
Initial symptom			0.429
Ischemic symptom	2 (50)	0 (0)
Headache	2 (50)	4 (100)
Hypertension	2 (50)	0 (0)	0.429
Diabetes	1 (25)	0 (0)	1.000
Hyperlipidemia	1 (25)	1 (25)	1.000
Smoking	1 (25)	2 (50)	1.000
Old CVA	0 (0)	0 (0)
Family history	0 (0)	1 (25)	1.000
VW-MRI
Dissecting flap	4 (100)	2 (50)	0.429
Double lumen	4 (100)	1 (25)	0.143
Intramural hematoma	4 (100)	1 (25)	0.143
Increased outer diameter	4 (100)	4 (100)	NA
Onion-skin appearance	4 (100)	0 (0)	0.029*
Wall enhancement	4 (100)	2 (50)	0.429
Preserved patency	4 (100)	3 (75)	1.000
Eccentricity index	0.84 (0.74–0.94)	0.54 (0.39–0.72)	0.059
Remodeling index	16.56 (7.80–24.71)	2.39 (2.11–2.97)	0.021*
Normalized wall index	0.98 (0.96–0.99)	0.67 (0.65–0.76)	0.021*
rsIMH	4.60 (3.21–4.92)	1.38 (1.24–1.46)	0.021*
TOF-MRA
Dissecting flap	4 (100)	2 (50)	0.429
Double lumen	4 (100)	1 (25)	0.143
Intramural hematoma	4 (100)	0 (0)	0.029*
Increased outer diameter	3 (75)	3 (75)	1.000
Preserved patency	3 (75)	3 (75)	1.000
Remodeling index	12.96 (7.47–19.2)	2.02 (1.66–2.89)	0.021*
rsIMH	2.67 (1.91–3.28)	1.07 (0.96–2.16)	0.149

Data are expressed as the number of cases with percentages in parentheses or median (interquartile range). VW-MRI vessel wall magnetic resonance image; TOF-MRA time of flight-magnetic resonance angiography; CVA cerebrovascular accident; rsIMH relative signal intensity of intramural hematoma. * indicates statistical significance (P < 0.05).