A patient presented with pus in urine. Urine culture was done which was negative. After a sudden onset renal failure the patient died. On autopsy the following finding was seen in kidney. What is the most likely diagnosis?

Ans. (a) TB kidneyThe clinical history is suggestive of sterile pyuria. The gross morphology shows greyish white are caseating necrotic material which is formed in patches, predominantly in the cortical areas involving the while circumference of the kidney. Hence, the first possibility is renal TB.