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The biopsy shown here is from a seven-year-old female with nephrotic syndrome. Her serum Cr was increased to 0.9 mg/dl and her urine protein/creatinine ratio was 7. She was s/p nephrectomy for renal cell carcinoma and had been treated with bevacizumab for six months prior to the biopsy. Serum C3 and C4 levels were normal and her platelet count was also normal. On biopsy, glomeruli show extensive basement membrane duplication and segmental hyalinosis of the glomerular tuft (arrow). These glomerular changes are characteristic of VEGF inhibitor-associated glomerulopathy. There is evidence to suggest that VEGF production by podocytes is required for...