Right  and left renal is 0.07,both kidney shows renal cortical echoes with moderately maintained cortico medullary differentiation, doctor suggested to take renal biopsy is it compulsory to Take, is this serious condition , fatty liver present , patient showing continuous urination , Prevoid urine 100cc Post void is 55cc Grade 1 prostatomegaly with minimal intravesical extension and significant postvoid residual.urine Phosphorus value 5.8 Visualized prostate mildly enlarged measuring 4.7×3.3×3.3 vol 28cc No evidence of calculi