hi der Prerenal causes of anuria Decreased cardiac output Hypovolemia Peripheral vasodilatation Reno vascular obstruction Severe vasoconstriction Internal Cause Acute tubular necrosis Cortical necrosis Glomerulonephritis Papillary necrosis Renal vascular occlusion Vacuities Postrenal Causes Bladder obstruction Ureteral obstruction Urethral obstruction Inspect and palpate the abdomen for asymmetry, distention, or bulging. Inspect the flank area for edema or erythema, and percuss and palpate the bladder. Assess a urine sample for cloudiness and foul odor. kindly consult nephrologist and urologist.