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Renal parenchymal malakoplakia. Histologic spectrum and its relationship to megalocytic interstitial nephritis and

A R Esparza1, D B McKay, J J Cronan

  • 1Department of Pathology, Rhode Island Hospital, Providence 02903.

The American Journal of Surgical Pathology
|March 1, 1989
PubMed

Insights

This study details five renal parenchymal malakoplakia cases, revealing a spectrum of this rare inflammatory condition. Findings highlight diverse histologic presentations, including previously unreported kidney manifestations.

Area of Science:

  • Nephrology
  • Pathology
  • Inflammatory Diseases

Background:

  • Renal parenchymal malakoplakia is an uncommon inflammatory process.
  • Its histologic spectrum in the kidney is not well-defined.

Observation:

  • Five cases of renal parenchymal malakoplakia were analyzed.
  • Histologic findings varied, with only one case showing the classical picture.
  • Two cases mimicked megalocytic interstitial nephritis, and two presented novel morphologies.

Findings:

  • The study identified a spectrum of renal malakoplakia, including pseudosarcomatous and granulomatous forms.
  • Michaelis-Gutmann bodies, key diagnostic markers, were present but varied in abundance.
  • Electron microscopy confirmed calcific inclusions in cases with few visible bodies.

Implications:

  • These findings expand the recognized histologic spectrum of renal malakoplakia.
  • Recognizing these diverse presentations is vital for differentiating malakoplakia from other renal pathologies.
  • Further research may elucidate the developmental stages of this inflammatory process.

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