Intrarenal AKI occurs where?

• A. In the kidney itself
• B. In the renal artery
• C. In the ureter
• D. In the bladder

Answer: (A)

Intrarenal AKI means injury to the kidney tissue itself—the renal parenchyma. This intrinsic renal damage can arise from ischemia or exposure to nephrotoxins, inflammatory or glomerular/interstitial diseases, and it directly affects the structures inside the kidney.

This is different from prerenal AKI, where the problem is reduced blood flow to the kidneys (before the kidney filters the blood), and from postrenal AKI, where obstruction in the urinary tract after filtration (such as in the ureter or bladder) leads to kidney injury. So the site of injury for intrarenal AKI is inside the kidney itself.