Renal segmental hypoplasia, also Ask-Upmark kidney, is a kidney with a partially developed or atrophic renal cortex.
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Cause
It is thought to be congenital or the consequence of vesicoureteral reflux.
Significance
Ask-Upmark kidneys are a cause of secondary hypertension that can be curable.
References
Renal segmental hypoplasia Wikipedia(Text) CC BY-SA