[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [General pathology](https://durgical.com/en/general-pathology/) › [Kidney](https://durgical.com/en/general-pathology/areas/kidney/) › Hypertensive nephrosclerosis: benign vs malignant

# Hypertensive nephrosclerosis: benign vs malignant

- Lesion

Long-standing hypertension glazes small renal arteries and slowly shrinks the kidneys; very high pressure tears them open.

Updated Nov 12, 2026

## Key points

- Benign nephrosclerosis: hyaline arterioles, small symmetric kidneys with a finely granular (leather-grain) surface.
- More severe with diabetes, older age and in people of African descent (with APOL1 variants).
- Malignant hypertension: fibrinoid necrosis of arterioles and onion-skin intimal hyperplasia; flea-bitten kidney.
- Can arise de novo or on top of chronic hypertension or scleroderma.
- Retinopathy, encephalopathy, heart failure and microangiopathic hemolysis go with the malignant phase.

## What it is

This page covers the kidney view of hypertensive vascular disease. In benign nephrosclerosis, chronic moderate hypertension causes hyaline arteriolosclerosis and fibroelastic thickening of small arteries, with ischemic loss of nephrons and symmetric, finely granular contracted kidneys. In malignant hypertension, pressure rises abruptly or very high and injures endothelium, producing fibrinoid necrosis and onion-skin hyperplastic arteriolosclerosis, a thrombotic microangiopathy with rapid kidney failure.

## Structure

- Benign: kidneys slightly small; cortex thin; surface finely and evenly granular.
- Arterioles show homogeneous pink hyaline walls; interlobular arteries show medial hypertrophy and reduplicated elastic lamina.
- Patchy ischemic atrophy: tubular atrophy, interstitial fibrosis and globally sclerosed glomeruli.
- Malignant: pinpoint petechial hemorrhages on the surface; fibrinoid necrosis, concentric layered smooth muscle (onion skin), necrotizing glomerulitis.

## Benign vs malignant nephrosclerosis

| Pattern | Vessel lesion | Gross kidney | Course |
| --- | --- | --- | --- |
| [Benign nephrosclerosis](https://durgical.com/en/conditions/hypertensive-nephrosclerosis/) | Hyaline arteriolosclerosis, fibroelastic hyperplasia | Small, symmetric, finely granular | Slow loss of GFR, mild proteinuria |
| [Malignant hypertension](https://durgical.com/en/conditions/hypertensive-emergency-and-urgency/) | Fibrinoid necrosis, hyperplastic (onion-skin) arteriolosclerosis | Petechiae: flea-bitten surface | Rapid kidney failure, retinopathy, encephalopathy |

## Clinical notes

- Hypertension is the second cause of chronic kidney disease after diabetes, and kidney damage itself raises blood pressure.
- Malignant hypertension needs emergency lowering of pressure; high renin from ischemic kidneys perpetuates the cycle.

## Memory aid

Slow pressure glazes the arterioles; sudden pressure peels them like an onion and spatters the surface.

## Test yourself

Think of the answer, then tap the question to see it.

## What is the vascular lesion of benign nephrosclerosis?

Hyaline arteriolosclerosis: homogeneous pink thickening of arteriolar walls by leaked plasma proteins and matrix.

## Why is the kidney flea-bitten in malignant hypertension?

Ruptured, necrotic arterioles and glomerular capillaries cause pinpoint hemorrhages on the cortical surface.

## What does onion-skinning mean?

Concentric layers of smooth muscle and basement membrane in the arteriolar wall: hyperplastic arteriolosclerosis.

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## Elsewhere in DurgiPedia

- [Physiology of hypertension](https://durgical.com/en/physiology/physiology-of-hypertension/)
- [Long-term blood pressure control by the kidney](https://durgical.com/en/physiology/long-term-blood-pressure-control-by-the-kidney/)

## Connections

## Related 5

- [Arteriosclerosis: the three patterns](https://durgical.com/en/general-pathology/arteriosclerosis-the-three-patterns/)
- [Hypertension: mechanisms](https://durgical.com/en/general-pathology/hypertension-mechanisms/)
- [Renal artery stenosis](https://durgical.com/en/general-pathology/renal-artery-stenosis/)
- [Thrombotic microangiopathy: the kidney](https://durgical.com/en/general-pathology/thrombotic-microangiopathy-the-kidney/)
- [Hypertensive heart disease and cor pulmonale](https://durgical.com/en/general-pathology/hypertensive-heart-disease-and-cor-pulmonale/)

## Related conditions 6

- [Hypertensive nephrosclerosis](https://durgical.com/en/conditions/hypertensive-nephrosclerosis/)
- [Arterial hypertension](https://durgical.com/en/conditions/arterial-hypertension/)
- [Hypertensive emergency and urgency](https://durgical.com/en/conditions/hypertensive-emergency-and-urgency/)
- [Systemic sclerosis (scleroderma, including CREST)](https://durgical.com/en/conditions/systemic-sclerosis/)
- [Chronic kidney disease](https://durgical.com/en/conditions/chronic-kidney-disease/)
- [Hypertensive retinopathy](https://durgical.com/en/conditions/hypertensive-retinopathy/)

[← All of general pathology](https://durgical.com/en/general-pathology/)

Educational content on the mechanisms of disease; not a diagnostic or treatment guide and no substitute for a health professional's advice. No doses are given.

Sources: [Chronic Kidney Disease](https://www.ncbi.nlm.nih.gov/books/NBK535404/) (StatPearls (NCBI Bookshelf), 2024).

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Representative model, for educational purposes only.

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License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/general-pathology/hypertensive-nephrosclerosis-benign-vs-malignant/