Representative light micrographs of renal biopsy findings. Representative renal biopsy findings in cases of (A) LBW-FSGS (13-year-old boy with an eGFR of 68.4 ml/min per 1.73 m2), (B) NBW-FSGS (8-year-old boy with an eGFR of 170.7 ml/min per 1.73 m2), and (C) NBW-MCNS (14-year-old girl with an eGFR of 123.1 ml/min per 1.73 m2). Periodic acid–methenamine silver stain was used (original magnification, ×50). All glomeruli are indicated with a circle. LBW-FSGS, low birth weight–FSGS; NBW-FSGS, normal birth weight–FSGS; NBW-MCNS, normal birth weight–minimal change nephrotic syndrome.