Mycotic aneurysm of the renal artery

Three cases of mycotic aneurysm of the renal artery are presented, all of which manifested similar findings on excretory urography and renal arteriography: small intrarenal aneurysm with distal occlusion, corresponding nephrographic defect or defects on urography and arteriography, and opacification of a normal collecting system. To the authors' knowledge these findings have not been reported previously, and they appear to represent a distinctive combination of findings diagnostic of mycotic aneurysm. The significance of recognizing this pattern, particularly as an aid in establishing an early diagnosis of infective endocarditis, is stressed.