Morphology - concentric, onion skin thickening of walls of arterioles
Clinical significance - associated with malignant or accelerated hypertension
Pathogenesis - vasoconstriction
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiMZPc0yv0rE45dshl3_-dAIk-a0y_G4v-jrZyJBm2bkn_4NSJQJNFCl74H8e278GFJ4NN2jLapUnHX5kbVvAxx4f52QU4PSjOG-ygTxySBGihqy1UCRTCk5HNC1bZugpDFSQwlEdnSRrQ/s320/Hyperplastic+Arteriolosclerosis.png)
Hyperplastic Arteriolosclerosis. The renal artery at left has a concentric,
onion-skin-like thickening.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWNmf9g3Fshehb3FzH1yyvE5hzeyofSGrmckDM0Weyylb9l42V3LQTYgzUbr95jmvJ7AK2lbDcheSC9_1xaG65e4DtZKhxbVDtdmoLIzyavYhglyOLXYXiwy4PxC0mxhhrS1yO-QR_MWs/s320/Kidney+in+malignant+hypertension.png)
Kidney in malignant hypertension. It is atrophic, has irregular small infarcts, and a
more coarsely irregular cortical surface than in the arterionephrosclerosis seen earlier.
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