Chronic pyelonephritis in elderly patients is a nonspecific infectious and inflammatory disease of kidneys that affects renal parenchyma, mainly interstitial tissue, pelvis and calyces [2, 6, 7]. Chronic pyelonephritis in the elderly occurs in 15-25% of cases [8, 9].

The aim of the work is to study the difficulty of diagnosing and treating chronic pyelonephritis in elderly patients due to the peculiarities of its low-symptomatic and latent course.