etiologically the cases fall into three groups : - ( 1 ) those due to definite disease of the kidney or its blood-vessels , 58 % . ( 2 ) those due to extra-renal causes , 22 % . ( 3 ) those cases whose cause is obscure , 20 % .in the first group neoplasms and inflammations of the kidney , aneurysms of the renal artery and arteriosclerosis are obvious causes .
C0022658
disease of
C0022646
renal