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[Membranous nephritis after renal transplantation].

8 cases of membranous glomerulonephritis (MG) after renal transplants (RT) are presented; one being a recurrence of the original disease and the other 7 due to a different cause of renal insufficiency. The total incidence of MG after transplantation was 1.63%; 1.39% being the incidence of MG of new cases. Only 1 patient showed decrease of renal function and in this case the MG was accompanied by chronic rejection lesions. There was no sign of neoplasias nor drugs producing MG. As far as chronic infections are concerned, only one patient showed B antigen and it was not observed during the immunofluorescent test in the biopsy. 6 patients had urological complications after the renal transplant (3 cases of urinary fistula; 2 cases of obstructive uropathy; 1 case of short ureter). 2 patients experienced the start of hemodialysis due to focal and segmentary glomerulosclerosis. The beginning of proteinuria commences between 2 and 23 months after the RT (median 13,0 +/- 7,5 moths); with a range of between 2.0 and 12.0 gr/day (median: 6.8 +/- 3,2 Z gr/day), this being nephrotic in 4 cases. Proteinuria improved 1 case, and persisted in the other patients at the same level registered previous to the diagnosis. MG is a non-frequent complication or RT and is usually benign. Patients with post-transplant urologic complications could be considered to have a higher risk of developing a MG "de novo".