Table 1

Baseline characteristics of patients presenting with mass effect

CharacteristicTotalMass effectP value
N=1171N=218
Age, years53.9±11.454.3±11.80.846
Sex0.148
 Male358 (30.6%)56 (25.6%)
 Female813 (69.4%)162 (74.0%)
Smoking0.339
 Never863 (73.7%)167 (76.3%)
 Previous91 (7.8%)19 (8.7%)
 Current217 (18.5%)32 (14.6%)
Alcohol abuse0.454
 Never1027 (87.7%)197 (90.0%)
 Previous118 (10.1%)16 (7.3%)
 Current26 (2.2%)5 (2.3%)
Family history of aneurysm18 (1.5%)4 (1.8%)0.746
Comorbidities
 Hypertension397 (33.9%)84 (38.4%)0.187
 Diabetes63 (5.4%)9 (4.1%)0.444
 Hyperlipidaemia42 (3.6%)6 (2.8%)0.536
 Cerebral infarction54 (4.6%)10 (4.6%)0.987
 Cardiac disease58 (5.0%)5 (2.3%)0.083
Onset symptoms
 Incidental425 (36.3%)0 (0%)<0.001
 Symptomatic704 (60.1%)218 (100%)
  Nausea and vomiting40 (18.3%)
  Cranial neurological deficit178 (81.7%)
 Current SAH42 (3.2%)0 (0%)
Patients with multiple aneurysms260 (22.2%)50 (22.8%)
Total number of aneurysms treated with the Pipeline Embolization Device1322218
Aneurysm size (maximum aneurysm length, mm)12.79±8.7519.60±10.360.658
 <10 mm630 (47.7%)43 (19.7%)0.001
 10–25 mm555 (42.0%)115 (52.85%)
 >25 mm137 (10.4%)60 (27.5%)
Aneurysm neck width, mm6.21±3.928.96±7.460.335
Parent artery diameter, mm3.88±0.823.94±0.760.059
Aneurysm form0.071
 Saccular1099 (83.1%)184 (84.4%)
 Fusiform192 (14.6%)34 (15.6%)
 Blister31 (2.3%)0 (0%)
Location0.355
 Anterior circulation1153 (87.2%)195 (89.0%)
 Cavernous269 (20.3%)81 (37.5%)
 Paraophthlamic707 (53.5%)101 (46.3%)
 Posterior communicating and choroidal111 (8.4%)12 (5.5%)
 Terminus18 (1.4%)1 (0.6%)
 Anterior circulation distal48 (3.6%)0 (0%)
Posterior circulation169 (12.8%)23 (11.0%)
 Basilar29 (2.2%)3 (1.4%)
 Vertebral artery and other vessels in the posterior circulation*140 (10.6%)20 (9.1%)
  • Data are shown as n (%) or the mean±SD.

  • *Other vessels in the posterior circulation include the posterior cerebral artery and posterior inferior cerebellar artery.

  • SAH, subarachonoid hemorrhage.