Urinalysis shows 2+ proteinuria

A 24-year-old woman with a recent history of acute hepatitis B infection presents with reddish-blue lesions on her lower extremities, fever, muscle pain, and mild weight loss. Physical examination reveals numerous regions of red-purple discoloration affecting the skin of both legs. Laboratory tests demonstrate positive P-ANCA and an elevated erythrocyte sedimentation rate. Urinalysis shows 2+ proteinuria. Biopsy of lesional skin is shown in the figure. Which of the following is the most likely diagnosis?

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  1. Benign arteriosclerosis
  2. Fibromuscular dysplasia
  3. Henoch-Schönlein purpura
  4. Mönckeberg medial sclerosis
  5. Polyarteritis nodosa