21. Pyelonephritis abscedens. Necrosis of papilla

Organ: Kidney


Necrosis of the papilla (or pyramids) are visible as greyish foci of triangular-like shape.

Diagnosis: Acute pyelonephritis


  • Ascending bacterial infection from urinary tract


Another morphological sign of acute pyelonephritis is the presence of many microabscesses, however this can’t be seen on this preparation.

Acute pyelonephritis commonly occurs as a complication of hydronephrosis after an obstruction of the lower urinary tract, commonly by a kidney stone. Diabetics are especially vulnerable to develop acute pyelonephritis.

Acute pyelonephritis can lead to sepsis.

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20. Polycystic kidney (adult type)

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22. Nephrosclerosis

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