Cerebral angiography and MR perfusion images in @entity1 with XXXX .

@entity1 @entity2806 @entity63 @entity98 @entity1188
OBJECTIVE: To evaluate the value of perfusion MR imaging and angiographic evidence of collateral circulation in symptomatic @entity1 with @entity63 ( @entity63 ). METHODS: Cerebral angiography and perfusion MR were performed in 16 @entity1 with symptoms of @entity63 . Qualitative perfusion maps were calculated for regional cerebral blood volume (rCBV) and mean transit time ( @entity98 ). RESULTS: A total of 27 lesions were seen on the perfusion MR maps (6 @entity1188 and 21 @entity2806 ) and most of them (26/27) showed a prolonged @entity98 . @entity98 is sensitive to the presence of @entity2806 , but not sufficient in distinguishing @entity1188 from @entity63 . All of the @entity1188 showed a decreased rCBV, while most of the @entity2806 showed a normal or increased rCBV. When collateral circulation was identified on angiography, most @entity2806 were not @entity1188 and had a normal or increased rCBV. The absence of angiographically identifiable cerebral collaterals may not always result in an @entity1188 ; 50% had decreased rCBV. Despite the absence of angiographic collaterals, the other half had normal or increased rCBV. CONCLUSION: Cerebral angiographic evidence of collateral circulation is important in identifying a favorable outcome in @entity1 with @entity63 . However, a lesion with a normal or increased rCBV suggests a sufficient collateral circulation even without angiographic collaterals. Perfusion images may be a potentially useful adjunctive tool in the prediction of the outcome of @entity63 , particularly where no apparent collateral macrocirculation is seen on CA.
