Table 4 Other characteristics of UIAs in 4D-CTA and DSA

Shape

No lobe

22

18

22

14

34/46(74%)

One or two lobes

16

22

16

18

More than two lobes

8

6

8

14

Maximum diameter

Small (4mm-6mm)

6

6

6

6

42/46(91%)

Medium (7mm-10mm)

16

16

16

18

Large (10mm-25mm)

20

20

20

18

Narrow (smaller than the dome diameter)

16

14

16

14

Neck

Medium (equal to the dome diameter)

20

24

20

26

36/46(78%)

Wide (larger than the dome diameter)

10

8

10

6

Proximity to parent and branch vessels

Poor (cannot display parent and branch vessels)

0

0

0

0

40/46 (87%)

Fair (clear parent but unclear branch vessels)

4

6

4

2

Good (clear visualization of parent and branch vessels)

42

40

42

44