Abnormal renal vascular morphology Renal vasculitis Vasculitis (inflammation of blood vessels) in the kidney. Renal vasculitis can be observed with numerous disorders and presents clinically as rapidly progressive glomerulonephritis (RPGN) which is characterised by acute kidney injury (AKI), haematuria and proteinuria. Histological examination of the kidney reveals severe inflammation in the form of crescent formation, glomerular necrosis and vasculitis of small and medium sized vessels within the kidney.