Renal segmental hypoplasia

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Renal segmental hypoplasia, also known as Ask-Upmark kidney,[1] is rare benign pathology of the kidney that may cause hypertension.[2]

It is also known as segmental renal atrophy.



  • Acquired versus congenital.[1]


  • Focal parenchymal loss.



  • Fibrosis.
  • Lack of renal parenchyma.

See also


  1. 1.0 1.1 Arant, BS.; Sotelo-Avila, C.; Bernstein, J. (Dec 1979). "Segmental "hypoplasia" of the kidney (Ask-Upmark).". J Pediatr 95 (6): 931-9. PMID 501498.
  2. 2.0 2.1 Babin, J.; Sackett, M.; Delage, C.; Lebel, M. (Apr 2005). "The Ask-Upmark kidney: a curable cause of hypertension in young patients.". J Hum Hypertens 19 (4): 315-6. doi:10.1038/sj.jhh.1001822. PMID 15647775.
  3. Fay, R.; Winer, R.; Cohen, A.; Brosman, SA.; Bennett, C. (Apr 1975). "Segmental renal hypoplasia and hypertension.". J Urol 113 (4): 561-4. PMID 1117534.