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Table 4: Subarachnoid hemorrhage pattern and final diagnosis^{^a}
Pattern of SAH
No SAH^{^b} Perimesencephalic Sulcal Diffuse IVH
No source identified 0 68 (96%) 24 (65%) 79 (85%) 13 (100%)
Aneurysm/pseudoaneurysm 0 2 (3%) 0 16 (17%) 0
AVF 0 0 1 (3%) 0 0
AVM 0 0 1 (3%) 0 0
Vasculitis 0 1 (1.5%) 12 (32%) 0 0
Cavernous malformation 1 (3%) 0 0 0 0
↵a Percentages reflect patient percentage with a vascular pathology within each SAH pattern.
↵b “No SAH” refers to patients with xanthochromia or isolated IVH.

	Pattern of SAH
	No SAH^{^b}	Perimesencephalic	Sulcal	Diffuse	IVH
No source identified	0	68 (96%)	24 (65%)	79 (85%)	13 (100%)
Aneurysm/pseudoaneurysm	0	2 (3%)	0	16 (17%)	0
AVF	0	0	1 (3%)	0	0
AVM	0	0	1 (3%)	0	0
Vasculitis	0	1 (1.5%)	12 (32%)	0	0
Cavernous malformation	1 (3%)	0	0	0	0