MEDULLERY SPONGE KIDNEY CONGENITAL ABNORMAL GROWTH ADDER TUBE/THE CUMULATIVE TUBES HAVE CHARACTERISTIC CYSTIC DILATION AND DEFORMATION/THE MORE THEY GIVE OVER THE KIDNEY SPONGINESS/BOTH KIDNEY INFECT ONLY A SHELL/URETERAL AND RENAL PROTRUSION LAYER NOT SYNENONONTAI/ASYMPTOMATIC/PERSONS UNDERGOING PYELOGRAPHY OCCURS AT A LOW RATE SISEASE [0,5%]/IN THE GENERAL POPULATION IS ESTIMATED 1/5000-20000