Case History: A 61-year-old man undergoes abdominal aortic aneurysm correction surgery, a procedure without intraoperative complications. Two days later, he presented elevated serum creatinine from a baseline of 1.4 to 4.2 mg/dL, proteinuria less than 1 g/d, and microhematuria. He has a history of diabetes mellitus, dyslipidemia, and hypertension. Immune markers, virology, protein electrophoresis are normal. Direct immunofluorescence for IgA, IgG, IgM, C3, C1q, kappa, and lambda: Negative. See the images of the renal biopsy and differential diagnosis below then choose the most accurate answer.