Table 3

Unruptured intracranial aneurysm treatment score³⁵

Patient-related	Age (single)
	<40 years	4
	40–60 years	3
	61–70 years	2
	71–80 years	1
	>80 years	0
	Risk factors (multiple)
	Previous SAH from different aneurysm	4
	Familial intracranial aneurysm or subarachnoid haemorrhage	3
	Japanese, Finnish, Inuit ethnicity	2
	Cigarette smoking	3
	Hypertension (blood pressure >140 mm Hg)	2
	Autosomal dominant polycystic kidney disease	2
	Current drug abuse	1
	Clinical symptoms (multiple)
	Cranial nerve deficit	4
	Clinical/radiological mass effect	3
	Thromboembolic event from UIA	2
	Epilepsy	1
	Other (multiple)
	Reduced QoL due to rupture fear	2
	Aneurysm multiplicity	1
	Life expectancy
	<5 years		4
	5–10 years		3
	>10 years		1
	Comorbid disease (multiple)
	Neurocognitive disorder		3
	Coagulopathies/thrombophilia		2
	Psychiatric disorder		1
Aneurysm	Maximum diameter (single)
	<3.9 mm	0
	4.0–6.9 mm	1
	7.0–12.9 mm	2
	13.0–24.9 mm	3
	>25 mm	4
	Morphology (multiple)
	Irregularity or loculation	3
	Size ratio >3 or aspect ratio >1.6	1
	Location (single)
	Basilar bifurcation	5
	Vertebrobasilar artery	4
	Anterior or posterior communicating artery	2
	Other (multiple)
	Aneurysm growth on serial imaging	4
	Aneurysm de novo formation on serial imaging	3
	Contralateral steno-occlusive disease	1
Treatment	Age-related risk
	<40 years		0
	41–60 years		1
	61–70 years		3
	71–80 years		4
	>80 years		5
	Aneurysm size-related risk
	<6.0 mm		0
	6.0–10.0 mm		1
	10.1–20.0 mm		3
	>20 mm		5
	Aneurysm complexity-related risk
	High		3
	Low		0
	Intervention-related risk onstant		5
	Total score
	Score favours UIA	Repair	Conservative