title: Pyelonephritis and interstitial nephritis--clinical-pathological correlations.
abstract: OBJECTIVE
  The relation between histological and clinical parameters were studied in 54 consecutive patients with acute interstitial nephritis or pyelonephritis without primary glomerular disorders, in all of whom percutaneous renal core biopsy had been performed.
  
  
  METHODS
  Based on clinical criteria and without detailed knowledge of the appearance of the biopsy, the material was divided into 4 main groups: patients with septic and/or tubulotoxic conditions, hypersensitivity reactions (eosinophilic nephritis), ascending infections and other specified conditions.
  
  
  RESULTS
  The overall correlation between the histological and the clinical diagnoses was good, but there were large overlaps between the histological findings in 3 of the groups, making classification of individual cases difficult. The histological and paraclinical findings were poorly correlated. Histologically, ascending infections were characterized by the presence of leukocyte casts and an increased number of neutrophilic granulocytes.
  
  
  CONCLUSIONS
  The material justifies the present rough classification of the conditions mentioned above. By kidney biopsy, the interstitial conditions can be separated from glomerular and other conditions, but the biopsy offers little information about the clinical severity or the prognosis.
authors.affiliation: Department of Nephrology P, Rigshospitalet, Copenhagen, Denmark.
authors.forename: O F
authors.initials: OF
authors.lastname: Thomsen
authors.forename: J
authors.initials: J
authors.lastname: Ladefoged
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001706:Biopsy; D004802:Eosinophilia / Q000097:blood / Q000145:classification / Q000473:pathology; D005260:Female; D005355:Fibrosis / Q000097:blood / Q000145:classification / Q000473:pathology; D005919:Glomerular Filtration Rate / Q000502:physiology; D006098:Granulocytes / Q000473:pathology; D006099:Granuloma / Q000097:blood / Q000145:classification / Q000473:pathology; D006801:Humans; D007668:Kidney / Q000166:cytology / Q000473:pathology / Q000503:physiopathology; D018655:Lymphocyte Count; D008214:Lymphocytes / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009000:Monocytes / Q000473:pathology; D009393:Nephritis / Q000097:blood / Q000145:classification / Q000473:pathology; D009395:Nephritis, Interstitial / Q000097:blood / Q000145:classification / Q000473:pathology*; D011704:Pyelonephritis / Q000097:blood / Q000145:classification / Q000473:pathology*; D012720:Severity of Illness Index; D013223:Statistics as Topic