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Obesity-Related Glomerulopathy

This biopsy is from a 61 year-old, morbidly obese patient, who presents with 6 month history of persistent proteinuria (UPCR: 3.7 gm/gm).  The displayed glomerulus is enlarged and shows an area of segmental sclerosis involving the perihilar region of the glomerulus. Additionally, electron microscopy showed only mild epithelial foot process effacement, and immunofluorescence was completely negative. All these morphologic features are supportive of a secondary (adaptive) form of focal segmental glomerulosclerosis (FSGS).  FSGS is a pattern of glomerular injury which may be primary or secondary.  One form of secondary FSGS is believed to be the result of glomerular hyperfiltration which...