1. In the pyelonephritic areas some juxtamedullary arteriole-glomerular units were converted to aglomerular arterioles forming arteriolae rectae verae.

2. In 5% of the cases we diagnosed pathological processes: renal agenesis (1), renal cysts (2), duplex kidney (3), glomerulonephritic scarring (3), pyelonephritic scarring (2), splenomegaly (1), steatosis of liver (4).