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Perimesencephalic subarachnoid hemorrhage was seen on CT in 25 patients; in four of these patients (16%), MR imaging revealed acute perforator territory infarction involving the caudate, putamen or thalamus. In 26 other patients, nonperimesencephalic subarachnoid hemorrhage was revealed on CT; in two of these patients (8%), MR imaging showed the cause of the subarachnoid hemorrhage. By contrast, 20 patients had negative findings on CT scans but exanthochromic CSF on lumbar puncture; in two of these patients (10%), MR findings were interpreted as responsible for subarachnoid hemorrhage. MR imaging showed diagnostic value in patients with angiographically negative subarachnoid hemorrhage, revealing abnormalities in 14% of the 71 patients, and resulted in a significant change in patient treatment of 6% of the patients. MR imaging also revealed an association between perimesencephalic subarachnoid hemorrhage and the infarcts involving the territory of perforating arteries at the base of the brain. This finding may provide insight into the pathogenesis of perimesencephalic subarachnoid hemorrhage. |
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aneurysm
aneurysm,intracranial
angiography,cerebral
cerebrovascular accident
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MRI,abnormal
MRI,spinal cord
MRI,spine
spinal cord,vascular malformation of
spinal epidural arteriovenous malformation
subarachnoid hemorrhage
subarachnoid hemorrhage,normal cerebral angiography with
subarachnoid hemorrhage,perimesencephalic
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