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Acute pyelonephritis is an exudative purulent localized inflammation of the renal pelvis (collecting system) and kidney. The kidney parenchyma presents in the interstitium abscesses (suppurative necrosis ), consisting in purulent exudate (pus): neutrophils, fibrin, cell debris and central germ colonies (hematoxylinophils).
Acute kidney injury (AKI), previously called acute renal failure (ARF), [1] [2] is a sudden decrease in kidney function that develops within seven days, [3] as shown by an increase in serum creatinine or a decrease in urine output, or both.
It is generally not recommended to perform routine radiographic imaging on patients who have simple urinary tract infections. When patients do not improve quickly with appropriate antibiotics, however, appropriate radiographic studies help diagnose pyonephrosis, emphysematous pyelonephritis, and renal and/or perirenal abscesses. [7]
Patients who have experienced an acute renal infarction usually report sudden onset flank pain, which is often accompanied by fever, nausea, and vomiting. [ 4 ] The primary causes of renal infarction are hypercoagulable conditions, renal artery damage (usually brought on by arterial dissection ), and cardioembolic illness.
Interstitial nephritis is uncommon (<1% incidence) in patients without any symptoms but occurs in about 10-15% of hospitalized patients with acute kidney injury of unknown cause. [2] While it can occur in patients of all ages, it is more common in elderly patients, perhaps due to increased exposure to drugs and other triggering causes. [2]
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Pyelonephritis is inflammation that results from a urinary tract infection that reaches the renal pelvis of the kidney. [6] Lupus nephritis is inflammation of the kidney caused by systemic lupus erythematosus (SLE), a disease of the immune system. [7] Athletic nephritis is nephritis resulting from strenuous exercise. [8]
In terms of cause, almost any condition that involves ischemia can lead to renal papillary necrosis. A mnemonic for the causes of renal papillary necrosis is POSTCARDS: pyelonephritis, obstruction of the urogenital tract, sickle cell disease, tuberculosis, cirrhosis of the liver, analgesia/alcohol use disorder, renal vein thrombosis, diabetes mellitus, and systemic vasculitis. [3]