PRTN3 and obesity due to melanocortin 4 receptor deficiency: Hx: 34 y M cocaine user; anamnestic obesity, hyperpigmented lesions, leukocitoclastic vasculitis due to levamisole; recently admitted to ED with proteinuria associated with fatigue/arthralgiasLab: urea 4.6 mmol/L; Cr 71 μmol/L; PCR 449.9mg/mmol; Na+ 140 mmol/L; K+ 4.4 mmol/L; ANA-; ENA-; c-ANCA-; p-ANCA+; HBV/HCV/HIV negRenal biopsy: no glomerular crescentic or necrotizing injury, glomerular artery wall normal, no artery vasculitisDx: development of MN after AAV secondary to LAC