Table 3. Location of ruptured single cerebral aneurysms.

Anterior circulation	ICA	MCA	ACA	AcoA	PcoA	AChA	PA	CMA	Sub-total
<40	12	14	2	43	13	0	3	0	87
40–49	34	48	12	106	67	1	1	2	271
50–59	41	58	7	98	148	1	2	0	355
60–69	35	27	7	58	113	1	0	0	241
> = 70	10	9	2	11	33	0	0	0	65
Sub-total	132	156	30	316	374	3	6	2	1019
Posterior circulation	VA	BA	PCA	PICA	SCA	Sub-total
Sub-total	12	19	14	7	2	54

ICA: internal carotid artery (including any aneurysm located in the intracranial portion of ICA), MCA: middle cerebral artery, ACA: anterior cerebral artery, AcoA: anterior communicating artery, PcoA: posterior communicating artery, AChA: anterior choroidal artery, PA: pericallosal artery, CMA: callosomarginal artery, VA: vertebral artery, BA: basilar artery, PCA: posterior cerebral artery, PICA: posterior inferior cerebellar artery, SCA: superior cerebellar artery.