National cohort of all cases of membranous nephropathy (MN) during a 1 year period in France, based on a pathological and/or serological diagnostic, collecting the data on:
* incidence of MN * prevalence of anti-PLA2R1 and anti-THSD7A * clinical outcome one year after diagnosis or after relapse (complete remission, partial remission or persistent nephrotic syndrome) * environmental risk factors for the onset of MN * HLA markers * patient care status in France
Age 18 years or more
Biopsy on a native kidney consistent with MN and/or positivity for serum anti-PLA2R1 and/or anti-THSD7A antibodies
Signed informed consent
Diagnosis error based on the kidney biopsy staining or on serology analyses for the positivity for anti-PLA2R1 and/or anti-THSD7A
Patients unable to give an informed consent
Patients withdrawing an informed consent