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:
Tubular necrosis
Visceral podocyte fusion
Mesangial deposits of IgA
Basement membrane thickening
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)
Kidney