a cystic renal mass may represent a simple renal cyst without clinical relevance , a cystic renal carcinoma , early evidence of polycystic kidney disease in a young patient , a rare cause of renal hypertension , a source of infection in a symptomatic patient ( infected renal cyst ) , or a manifestation of an infectious disease ( renal abscess , echinococcus cyst ) .
C0022646
renal
C0007134
renal