Inflammation of a specific segment of glomeruli within the kidney. The disease is IgA glomerulonephritis (MONDO_0005342). Also known as: Berger's IgA or IgG nephropathy, Berger's disease, IgA Nephropathy, IgA nephropathy, focal glomerulonephritis, primary IgA nephropathy, segmental glomerulonephritis.