Table 4 Radiological characteristics of elderly patients with intracranial aneurysms

SAH + ICH, (%)

–

29/176 (16.5)

–

–

Modified Fisher grade I-II, (%)

–

69/176 (39.2)

–

–

Modified Fisher grade III-IV, (%)

–

107/176 (60.8)

–

–

With irregular aneurysms, (%)

103/290 (35.5)

88/176 (50.0)

15/114 (13.2)

< 0.001

CAS, (%)

159/290 (54.8)

121/176 (68.8)

38/114 (33.3)

< 0.001

FTP, (%)

39/290 (13.4)

33/176 (18.8)

6/114 (5.3)

0.001

With multiple aneurysms, (%)

88/290 (30.3)

51/176 (29.0)

37/114 (32.5)

0.529

Dissecting aneurysms, (%)

12/290 (4.1)

7/176 (4.0)

5/114 (4.4)

0.896

Lesion diameter (SD)/mm

5.8 ± 4.6

5.1 ± 3.3

6.8 ± 6.0

< 0.001

Small-size aneurysm, (%)

158/290 (54.5)

113/176 (64.2)

45/114 (39.5)

< 0.001

Anterior circulation, (%)

280/290 (96.6)

172/176 (97.7)

108/114 (94.7)

0.301

ICA, (%)

204/290 (70.3)

124/176 (70.5)

80/114 (70.2)

0.959

MCA, (%)

58/290 (20.0)

38/176 (21.6)

20/114 (17.5)

0.400

ACA, (%)

24/290 (8.3)

18/176 (10.2)

6/114 (5.3)

0.134

Acom, (%)

32/290 (11.0)

18/176 (10.2)

14/114 (12.3)

0.586

Posterior circulation, (%)

24/290 (8.3)

10/176 (5.7)

14/114 (12.3)

0.076

PCA, (%)

4/290 (1.4)

2/176 (1.1)

2/114 (1.8)

0.940

PICA, (%)

2/290 (0.7)

2/176 (1.1)

0/114 (0)

0.678

VA, (%)

14/290 (4.8)

5/176 (2.8)

9/114 (7.9)

0.093

BA, (%)

4/290 (1.4)

1/176 (0.6)

3/114 (2.6)

0.339