Diffuse Alveolar Hemorrhage in IgA Vasculitis with an Atypical Presentation.

IgA vasculitis (IgAV) commonly occurs in young children, who present with a tetrad of purpura, abdominal pain, arthralgia and nephritis. Diffuse alveolar hemorrhage (DAH) is a rare complication of IgAV. We herein report an adult case of IgAV with a presentation of DAH and nephritis (pulmonary renal syndrome, PRS), but without other typical manifestations, such as purpura, abdominal pain and arthralgia. A 33-year-old man presented with hemoptysis and a low-grade fever and was diagnosed to have IgAV based on the results of a renal biopsy. Treatment with corticosteroids, cyclophosphamide, and plasmapheresis was effective. IgAV should therefore be considered in the differential diagnosis of adult PRS.