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Acute Lacunar Stroke in Association with Angiogram-Negative Subarachnoid Hemorrhage:Mechanistic Implications of Two Cases Stroke 26:891-895, Tatter,S.B.,et al, 1995 See this aricle in Pubmed Article Abstract A 68-and a 60-year old man each presented with acute onset of headache and meningismus.Computed tomography(CT)revealed subarachnoid hemorrhage in a perimesencephalic pattern and in the left sylvian fissure,respectively.In both instances,immediate CT revealed evidence of an early infarction in the distribution of a perforating artery originating at the site of the subarachnoid blood.Both of these strokes were demonstrated to be acute by evolution on serial imaging studies.No source for the subarachnoid blood could be found in either patient in cerebral angiograms repeated at 2 weeks.These observations suggest that in some cases of angiogram-negative subarachnoid hemorrhage the course of blood may be a small artery that is obliterated at the time of the hemorrhage.This observation provides an explanation for the low rate of rehemorrhage among patients with angiogram-negative subarachnoid hemorrhage.

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(click to filter results - removes previous filter) CAT scan CAT scan,abnormal cerebral infarction cerebrovascular accident lacunar infarction subarachnoid hemorrhage subarachnoid hemorrhage,normal cerebral angiography with subarachnoid hemorrhage,perimesencephalic

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