idiopathic retroperitoneal fibrosis


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  • Clinical

    • peak 40-60s
    • can be associated with IgG4 disease

  • Histology

    • early: predominantly lymphoplasmacytic infiltrate
    • late: dense collagen deposit, hyalinization. Entrapped nerve, vessels, ureter

  • Stains

    • IgG4 if suspected
    		•