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Ruptured Vertebrobasilar Aneurysms:Frequency of the Nonaneurysmal Perimesencephalic Pattern of Hemorrhage on CT Scans Radiology 201:657-660, Kallmes,D.F.,et al, 1996 See this aricle in Pubmed Article Abstract The mean frequency of nonaneurysmal perimesencephalic pattern of subarachnoid hemorrhage in ruptured vertebrobasilar aneurysms was 7.1%(48 of 676 readings)among the four readers.The mean frequency of aneurysms with the pattern of hemorrhage for each location was as follows:basilar tip,9.8%(41 of 420 reading);superior cerebellar artery,5.0%(four of 80 readings);and posteroinferior cerebellar artery,0%.In 75%(six of eight)of the cases in which the CT pattern of hemorrhage was deemed compatible by all readers with nonaneurysmal hemorrhage,the clinical presentation was mild.Because ruptured posterior fossa aneurysms manifest with the nonaneurysmal pattern of hemorrhage in approximately 10%of cases,a high degree of suspicion should be maintained even if the pattern of subarachnoid hemorrhage suggest a nonaneurysmal origin and clinical symptoms are mild.

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(click to filter results - removes previous filter) aneurysm aneurysm,vertebral basilar system CAT scan CAT scan,abnormal interobserver agreement subarachnoid hemorrhage subarachnoid hemorrhage,perimesencephalic

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