Table 1:

Etiologies of angiographic findings in nontraumatic ICH

Study	AVM	Aneurysm	Venous Sinus Thrombosis	Moyamoya^{^a}	Arterial or Venous Malformation	Mass Lesion	Negative Angiography Findings
Toffol et al, 1986⁵	9%	12%	3%	3%	–	–	72%
Halpin et al, 1994³¹	39%	14%	–		–	–	47%
Zhu et al, 1997⁸	25%	5%	2%	2%	–	–	66%
Griffiths et al, 1997³⁴	27%	22%	1%	–	–	–	50%
Hino et al, 1998⁴⁰	24%	2%	–	–	4%	3%	70%
Yeung et al, 2009⁷	24%	13%	–	2%	7%	5%	49%
Delgado Almandoz et al, 2009⁶	7%	4%	3%	0.3%	2%		84%
Delgado Almandoz et al, 2010^{32^b}	9%	3%	2%	1%	2%	–	84%

Note:— - indicates data not available.
↵a Moyamoya refers to congenital Moyamoya disease and/or acquired Moyamoya-like syndrome secondary to chronic intracranial arterial steno-occlusive disease.
↵b Prospective cohort only who had multidetector CTA imaging.