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pyelo- (relating to the renal pelvis) +‎ nephritis.


pyelonephritis (countable and uncountable, plural pyelonephritides)

  1. (medicine, pathology) An ascending urinary tract infection that has reached the pelvis of the kidney.
    • 1913, The American Journal of the Medical Sciences, Volume 145, page 54,
      The urinogenous or ascending nephropathies are divisible into two great groups (a) the hydronephrotic nephropathies and (b) the pyelonephritides.
    • 1991, G. Piccoli, F. Quarello, G. Beltrame, P. Colombo, T. Cammarota, 16: Reflux nephropathy, Alberto Amerio, Pasquale Coratelli, Shaul G. Massry (editors), Tubulo-Interstitial Nephropathies: Proceedings of the 4th Bari Seminar in Nephrology, Springer, page 152,
      The frequent spontaneous resolution of cystopyelic reflux after 10 years of age induces to consider at least part of the apparently primary pyelonephritides as secondary to yet disappeared refluxes and, thus, to allocate in this group most of the so-called atrophic pyelonephritides of the young, often monolateral or mostly affecting one kidney, with sterile urine and almost normal urinary sediment.
    • 2001, Jeffery Hughes, 12: Infectious Diseases, N. A. Hughes, Clinical Pharmacy, Macmillan Health, 2nd Edition, page 215,
      Primary acute pyelonephritis most commonly occurs in females, with 90% of cases caused by Escherichia coli.
    • 2009, J. Charles Jennette, Chapter 16: The Kidney, Emanuel Rubin, Howard M. Reisner (editors), Essentials of Rubin's Pathology, Wolters Kluwer Health, page 372,
      The kidneys of acute pyelonephritis have small white abscesses on the subcapsular surface and on cut surfaces.
    • 2010, Bhuvan Pathak, Chapter 29: Urinary Tract Infections in Pregnancy: From Symptomatic Bacteriuria to Pyelonephritis, T. Murphy Goodwin, Martin N. Montoro, Laila Muderspach, Richard Paulson, Subir Roy (editors), Management of Common Problems in Obstetrics and Gynecology, Wiley-Blackwell, 5th Edition, page 133,
      Pyelonephritis is most commonly encountered in younger, nulliparous women in their second trimester. Women with a history of pyelonephritis, renal calculi or anatomic malformations are particularly susceptible to the development of pyelonephritis and should therefore be regularly screened on a monthly basis throughout pregnancy.


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