Table 2.

Emergency MRI findings in patients imaged for non-traumatic headache

Finding	N (%*)
Cerebrovascular disease	63 (86)
Infarction	31 (97)
Intracranial hemorrhage	8 (100)
Cerebral venous thrombosis	8 (100)
Arterial dissection/occlusion	7 (100)
Aneurysm	6 (0)
Internal carotid artery stenosis	3 (33)
Infection/inflammation	41 (95)
Sinusitis	26 (92)
Central nervous system infection	13 (100)
Mastoiditis	1 (100)
Neuritis	1 (100)
Other	186 (23)
Non-specific white matter hyperintensities	52 (0)
Sinonasal mucosal thickening	32 (0)
Intracerebral/meningeal tumor	18 (83)
Leukoaraiosis	14 (0)
Signs of intracranial hypertension	12 (100)
Developmental venous anomaly	9 (0)
Demyelination	8 (75)
Cavernoma	6 (17)
Arachnoid cyst	5 (0)
Benign cyst	4 (0)
Pineal cyst	4 (0)
Hemosiderosis	4 (0)
Mega cisterna magna	4 (0)
Chiari malformation type 1	3 (100)
Signs of intracranial hypotension	3 (100)
Posterior reversible encephalopathy syndrome	2 (100)
Tonsillar ectopy	2 (0)
Pineal cyst apoplexy	1 (100)
Lymphadenopathy	1 (0)
Gliosis	1 (0)
Petrous apex effusion	1 (0)
Total	290 (47)

^*% of findings related to headache and thus considered clinically significant