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  • Title: Immunotactoid glomerulopathy with unusually thick extracellular microtubules and nodular glomerulosclerosis in a diabetic patient.
    Author: Ferluga D, Hvala A, Vizjak A, Koselj-Kajtna M, Mihelic-Brcic M.
    Journal: Pathol Res Pract; 1995 Jul; 191(6):585-96. PubMed ID: 7479381.
    Abstract:
    It has recently been suggested that immunotactoid glomerulopathy be separated from much more common fibrillary glomerulonephritis by ultrastructural features of highly organized immune deposits containing tubules of more than 30 nm in diameter. We report and discuss the results of a light, immunofluorescence and electron microscopic study of a needle renal biopsy from a 75-year-old, non-insulin dependant diabetic female presented with nephrotic syndrome, hypertension and a progressive renal failure. A unique coexistence of nodular glomerulosclerosis, as traditionally ascribed to diabetes with a peculiar type of immunotactoid glomerulopathy was confirmed by the exclusion of amyloidosis, monoclonal gammopathies, systemic autoimmune diseases and cryoglobulinemia. Mesangial, scattered subepithelial and segmentally prominent subendothelial immune deposits were found highly organized in mostly parallel arrays of 40 to 91 nm thick tubules. The average thickness of 67 nm exceeds the average diameter of tubules in all other 11 published cases of immunotactoid glomerulopathy to date. By immunofluorescence, predominantly capillary wall, thick, ribbon-like glomerular deposits contained IgG, IgM, kappa and lambda light chains of equal intensity, C3, C4 and fibrin related antigens. Mild to moderate glomerular cell proliferation associated with nodular sclerosis has been assumed to be causally related to immunotactoid deposits.
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