A 8 years old male had non blanching rashes over the skin and swelling of knee joint with hematuria +++ and protein + in urine. Microscopic analysis of his renal biopsy specimen is most likely to show:: (A) Tubular necrosis, (B) Visceral podocyte fusion, (C) Mesangial deposits of IgA, (D) Basement membrane thickening
Answer is C. c. Mesangial deposits of IgA(Ref: Nelson's 20/e p 1612, Ghai 8/e p 632)The given case scenario (palpable purpura, arthritis, hematuria and proteinuria) suggests a diagnosis of Henoch Schonlein purpuraIn H.S. purpura and IgA nephropathy, IgA deposits are present in mesangium (by immunofluorescence)