Diagnose This! (October 23, 2017)

This IF image is from a 22 y/o Asian male with hematuria. What immunoreactant does it represent and what is the diagnosis?

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This immunofluorescence photomicrograph shows mesangial limited staining that is global and bright. In context of the brief history this photomicrograph likely represents IgA and is most likely an IgA nephropathy.