A 40-year-old man comes to the physician because of a 2-day history of diffuse maculopapular rash. He has chronic headaches for which he takes ibuprofen. Urinalysis shows 2+ protein and 10-20 WBC/hpf. A renal biopsy is most likely to show which of the following?
Fibrin crescents
Inflammatory infiltrates in the interstitium
Mesangial deposition of IgA
Spike and dome appearance
Subendothelial deposits
