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  • Title: Superimposed nephritis: a separate entity among glomerular diseases?
    Author: Bertani T, Mecca G, Sacchi G, Remuzzi G.
    Journal: Am J Kidney Dis; 1986 Mar; 7(3):205-12. PubMed ID: 2937291.
    Abstract:
    The concomitant occurrence of two glomerular diseases in the same patient was diagnosed in seven out of 105 patients undergoing renal biopsy for suspected glomerulopathy. The most frequently associated disease was a membranous type glomerulopathy. The follow-up was characterized by a rapid deterioration of renal function and two patients were required to start a chronic hemodialysis program soon after the diagnosis. It is suggested that the observed coexisting patterns of glomerular injury do not occur on the basis of chance alone and should be considered as a separate entity in glomerular pathology. In all cases, clinical and pathologic findings were strongly suggestive for two consecutive distinct pathologic processes, thus justifying the use of the term superimposed nephritis. It is reasonable to assume that the mechanisms responsible for glomerular damage and for the evolution of the disease in superimposed nephritis are different from those regulating the corresponding glomerulonephritis when occurring alone. The high prevalence of membranous pattern in superimposed nephritis indicates that pre-existing glomerular alterations might favor an immune reaction in the subepithelial space.
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