A localised inflammatory necrotic mass of tissue involving renal parenchyma, caused by Staphylococcus aureus and coliform organisms, source of which is cutaneous infections like boil and carbuncle. Renal carbuncle is a cortical lesion following bacteremia.
It is a collection of infective fluid in the kidney. It is usually a sequela of acute pyelonephritis, where severe vasospasm and inflammation may occasionally result in liquefactive necrosis and abscess formation.