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Background and Aims Mesangial deposits Ig A was described the first time in 1968 by Berger and Hinglais. It remains the most common primary glomerulonephritis worldwide. It is often idiopathic but can also be secondary. The aim of our study is to describe the epidemiologic characteristics, the incidence and the anatomopathological features of 501 IgA nephropathy (IgA N) patients. Method It is a retrospective mono-centric study including patients having IgA N in the renal biopsy done in our department among a period of 17 years. Results We analyzed data of 8427 patients who underwent renal biopsy. 81% had glomerular nephropathy with 7.3% (501) IgA N. A male-to-female ratio of 2.27. The average age was 28.7 years. IgA N was primary in 80.2% cases and secondary in 17.8% cases. The most frequent secondary IgA N was rheumatoid purpura (74.8%). There was a male predominance in Berger‘s disease as well as in rheumatoid purpura. Berger’s disease was more common in adults, whereas rheumatoid purpura was more common in children. The main indication of renal biopsy was proteinuria with hematuria in 23.2% of cases and nephrotic syndrome in 23.8%. The association of non-nephrotic proteinuria, hematuria, arterial hypertension and renal injury was found in 9.3% whereas isolated macroscopic hematuria only in 6.4% of cases. According to HAAS classification, HAAS 3 was the most frequent. OXFORD classification used only from 2010, and M1, S1, E0, T0 and M1, S1, E0, T2 were the most frequent. Glomerular lesions were associated to tubulo interstitial and vascular lesions in 48.2% of cases. Conclusion IgA nephropathy is the most common glomerular disease and a frequent cause of end stage renal disease. Because of a clear increase of it’s incidence in our country and the delay in the diagnosis, a systematic screening of urines is needed in our country as it’s done in Singapore and Japan.

P0488IG A NEPHROPATHY: ANALYSIS OF 501 BIOPSY