MPO-ANCA-associated pulmonary-renal vasculitis in a patient with diabetes mellitus

Diabetes mellitus is one of the major causes of chronic renal failure. Typical findings of diabetic nephropathy are early hyperfiltration followed by microalbuminuria and overt proteinuria, resulting in a progressive decrease in glomerular filtration rate. Rapidly progressive glomerulonephritis has rarely been reported in patients with diabetes mellitus. Here, we describe a patient with MPO-ANCA-associated vasculitis, presenting with pulmonary-renal syndrome. Immunosuppressive treatment, including pulse methyl-prednisolone and cyclophosphamide, was administered and the disease was resolved.