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Compound angulation for the angiographic evaluation of renal artery stenosis.

The increasing role of percutaneous transluminal angioplasty in the therapy of renal artery stenosis has, in turn, emphasized the need to optimize imaging of the entire length of the main renal artery and its major branches. The usual angiographic positioning techniques for anteroposterior and oblique views may not be adequate to define the precise location and extent of a stenosis. The authors combine oblique projections with sagittal angulation of the x-ray tube to augment the standard imaging methods for selective renal arteriography.