Table 3

Unruptured intracranial aneurysm treatment score35

Patient-relatedAge (single)
<40 years4
40–60 years3
61–70 years2
71–80 years1
>80 years0
Risk factors (multiple)
Previous SAH from different aneurysm4
Familial intracranial aneurysm or subarachnoid haemorrhage3
Japanese, Finnish, Inuit ethnicity2
Cigarette smoking3
Hypertension (blood pressure >140 mm Hg)2
Autosomal dominant polycystic kidney disease2
Current drug abuse1
Clinical symptoms (multiple)
Cranial nerve deficit4
Clinical/radiological mass effect3
Thromboembolic event from UIA2
Epilepsy1
Other (multiple)
Reduced QoL due to rupture fear2
Aneurysm multiplicity1
Life expectancy
<5 years4
5–10 years3
>10 years1
Comorbid disease (multiple)
Neurocognitive disorder3
Coagulopathies/thrombophilia2
Psychiatric disorder1
AneurysmMaximum diameter (single)
<3.9 mm0
4.0–6.9 mm1
7.0–12.9 mm2
13.0–24.9 mm3
>25 mm4
Morphology (multiple)
Irregularity or loculation3
Size ratio >3 or aspect ratio >1.61
Location (single)
Basilar bifurcation5
Vertebrobasilar artery4
Anterior or posterior communicating artery2
Other (multiple)
Aneurysm growth on serial imaging4
Aneurysm de novo formation on serial imaging3
Contralateral steno-occlusive disease1
TreatmentAge-related risk
<40 years0
41–60 years1
61–70 years3
71–80 years4
>80 years5
Aneurysm size-related risk
<6.0 mm0
6.0–10.0 mm1
10.1–20.0 mm3
>20 mm5
Aneurysm complexity-related risk
High3
Low0
Intervention-related risk onstant5
Total score
Score favours UIARepairConservative
  • QoA, quality of life; UIA, unruptured incidental intracranial aneurysm.