A 49-year-old man comes to the physician for a one-week history of purpura over his lower extremities. The liver edge is palpable 4cm beneath the costal margin. Serum studies show positivity to hepatitis C RNA. Serum C4 is decreased. Urine protein and RBCs are positive. Which of the following conditions is most immunologically similar to this patient’s acute presentation?
Anaphylaxis
Arthus reaction
Contact dermatitis
Graft-versus-host disease
Graves disease
