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Comment by Gaspar-Alberto Motta-Ramirez on July 8, 2010 at 12:59pm

Renal Artery Aneurysm (RAA),
Measurements of renal artery diameter can differ depending on imaging modality used. In one study, ultrasound found mean renal artery measurements of 5.04 ± 0.74 mm; with angiography, they were found to be 5.68 ± 1.19 mm. In this study, the authors also found that when accessory renal arteries were found, the main renal artery measurements were significantly smaller in diameter than when one renal artery was present.
Aneurysm of the renal artery can be classified in relationship to the parenchyma of the kidney, as depicted in the image above. Extraparenchymal aneurysms predominate, comprising approximately 85% of all RAAs.11,15 The other 15% are intraparenchymal. Of the extraparenchymal type, roughly 70% are saccular, 20% are fusiform, and 10% are dissecting.
Of patients with RAAs, 20% present with bilateral pathology and 30% have multiple aneurysms.15 RAAs occur equally in men and women, although ruptures are more common in reproductive-aged women.