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Radiological and pathological assessment of the degree and extent of arterial injury caused by balloon angioplasty was performed in 20 renal arteries obtained at autopsy. Intact arteries were studied angiographically before and after dilatation and then examined histologically. Both normal and diseased arteries were subjected to varying degrees of dilatation. Damage ranged from minimal intimal disruption to major tears of the muscular media. Equivalent dilatory force created greater damage in the distal (muscular) than in the proximal (elastic) portion of the renal artery. There was no evidence of plaque remodeling or compression. 相似文献
995.
Castaneda-Zuniga WR; Lock JE; Vlodaver Z; Rusnak B; Rysavy JP; Herrera M; Amplatz K 《Radiology》1982,143(3):693-697
The optimal treatment for recurrent coarctation of the aorta remains undefined. Recurrent stenosis following surgical repair occurs in 6-48% of cases involving the thoracic aorta. Because of the high morbidity and mortality associated with surgery, an alternate approach such as transluminal angioplasty is desirable. To evaluate this possibility, the authors created several experimental lesions to test their capability for dilatation, using the percutaneous transluminal technique. The results indicate that balloon dilatation of coarctation after end-to-end anastomosis is difficult or impossible. Dilatation of other types of suture lines may also be difficult due to the large amount of fibrous tissue at the anastomotic site, which is not amenable to balloon dilatation. Thus surgery remains the preferred form of therapy. 相似文献
996.
Postburn convulsive disorders in children 总被引:2,自引:0,他引:2
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998.
Angiomyolipoma: ultrasonic-pathologic correlation 总被引:1,自引:0,他引:1
Hartman DS; Goldman SM; Friedman AC; Davis CJ Jr; Madewell JE; Sherman JL 《Radiology》1981,139(2):451
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Poldrack RA; Desmond JE; Glover GH; Gabrieli JD 《Cerebral cortex (New York, N.Y. : 1991)》1998,8(1):1-10
The learning of perceptual skills is thought to rely upon multiple regions
in the cerebral cortex, but imaging studies have not yet provided evidence
about the changes in neural activity that accompany visual skill learning.
Functional magnetic resonance imaging (fMRI) was used to examine changes in
activation of posterior brain regions associated with the acquisition of
mirror-reading skill for novel and practiced stimuli. Multiple regions in
the occipital lobe, inferior temporal cortex, superior parietal cortex and
cerebellum were involved in the reading of mirror-reversed compared to
normally oriented text. For novel stimuli, skilled mirror-reading was
associated with decreased activation in the right superior parietal cortex
and posterior occipital regions and increased activation in the left
inferior temporal lobe. These results suggest that learning to read mirror-
reversed text involves a progression from visuospatial transformation to
direct recognition of transformed letters. Reading practiced, relative to
unpracticed, stimuli was associated with decreased activation in occipital
visual cortices, inferior temporal cortex and superior parietal cortex and
increased activation in occipito-parietal and lateral temporal regions. By
examining skill learning and item- specific repetition priming in the same
task, this study demonstrates that both of these forms of learning exhibit
shifts in the set of neural structures that contribute to performance.
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