A 8-year-old male had non-blanching rashes over the shin and swelling of the knee joint with haematuria +++ and protein +. Microscopic analysis of his renal biopsy specimen is most likely to show –
This child has →

i) Rash             
ii) Arthritis (swelling of knee joint)                       
iii) Haematuria

All these suggest the diagnosis of Henoch Schonlein purpura
HSP is characterized by deposition of IgA in the mesangium.
Tubular necrosis
Visceral podocyte fusion
Mesangial deposits of IgA
Basement membrane thickening