What are the differences between benign and malignant nephrosclerosis?

Progression speed: Terminology is based on both - findings under microscope (e.g., as a result of kidney biopsy, which is not done frequently for hypertension) and progression rate. Generally, malignant nephrosclerosis is diagnosed when decline of the renal function is fast and there is significant amount of protein in the urine. Age, race, genetics, previous history of the uncontrolled blood pressure play role