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1、孤立性大脑凸面蛛网膜下腔出血病因病因病因 Vascular MalformationsSimilarly, cavernomas are rarely described as a cause of SAH.However, superficial and leptomeningeal cavernomas may be the source of cSAH. RCVS RCVS Vasculitides VasculitidesInfectious OriginCortical SAH may be seen after rupture of infectious aneurysms(cau
2、sed by infective endocarditis, meningitis, or rarely crypto-genically) (Fig 5).Headache is diffuse and vague, rather than thetypical excruciating 极痛苦极痛苦headache of noninfectious aneurysmal SAH.Usually, there are also general symptoms (eg, anorexia, weight loss, malaise, or fever)nIn infective endoca
3、rditis, MR imagingnmight show associated lesions (ischemic, microbleeds, brain abscesses).DSA might be used for the diagnosis of distal arterial lesions and for therapeutic purposes.Infectious OriginInfectious OriginInfectious OriginMoyamoyaAccordingtoarecentclassification,patientswithwellrecognized
4、associatedconditions(eg,sicklecelldisease，neurofibromatosistype1,cranialtherapeuticirradiation,andDownsyndrome)areconsideredashavingaMoyamoyasyndrome,whilepatientswithnoknownassociatedriskfactorsaresaidtohaveMoyamoyadiseaseMoyamoyaHigh-Grade StenosisFig 6. Pial vasodilation. A, Axial GRE T2 image sh
5、ows a left frontal sulcal SAH (black arrowhead), possibly located in the “watershed” territory between the anterior and the middle cerebralarteries. B, Axial maximum-intensity-projection reconstruction of CTA shows an asymmetry of the distal arteries, in favor of left pial vasodilation. C, Frontal p
6、rojection of 3D angiographyof the left carotid artery reveals a severe stenosis at the origin of the M2 branch (white arrowhead).Fig. 1 A CT demonstrates a left inferior temporal SAH. B This is confirmed on MRI. C Several areas of restricted diffusion are seen in the left MCA region. D Angiography d
7、emonstrates tight bilateral internal carotid stenosesposterior reversible encephalopathy syndromecerebral amyloid angiopathycerebral amyloid angiopathyA, Axial brain CT scan shows a subtle left rolandic hyperattenuation favoring minimal SAH (white arrowhead). B and C, Axial GRE T2 images show left temporal lobarhemorrhage, multiple microbleeds, and cortical hemosiderosis. D, Axial FLAIR image obtained after 7 months shows a new asymptomatic SAH in a left parietal sulcus (white arrowhead),which was previously normal (see B)谢谢大家！
