CTICasesMicroscopic Polyangiitis with Recurrent Diffuse Alveolar Hemorrhage
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Imaging findings
CT scans over a 10-year period show similar but more extensive patterns of multifocal lobular ground-glass opacity, some with a halo sign, and subpleural sparing. These findings are consistent with diffuse alveolar hemorrhage in the context of acute dyspnea and hemoptysis.
Key takeaways
Microscopic polyangiitis is an ANCA-associated vasculitis commonly causing diffuse alveolar hemorrhage and renal involvement. It can present with recurrent episodes over many years, even with prolonged asymptomatic periods. A systemic workup, including ANCA testing and kidney biopsy, is essential for patients with unexplained pulmonary hemorrhage.
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