Microscopic polyangiitis presenting urticarial erythema and Henoch-Schonlein purpura: two case reports.

Microscopic polyangiitis (MPA) is well known as a life-threatening member of a group of systemic vasculitis diseases. We report two cases of MPA. Case 1 was a 79-year-old-man who had been diagnosed with anti-neutrophil-cytoplasmic-antibody associated vasculitis (ANCA associated vasculitis) with alveolar hemorrhage and crescentric glomerulonephritis (CrGN).