Fatal outcome in isolated Pauci-immune pulmonary capillaritis: A case report.

Isolated Pauci-immune pulmonary capillaritis (IPIPC) is a rare form of small vessel vasculitis that affects only the lungs, causing inflammation of pulmonary capillaries and potentially leading to severe outcomes like alveolar haemorrhage. A 23-year-old woman with a prior diagnosis of rheumatoid arthritis presented with hemoptysis and respiratory distress, ultimately diagnosed with IPIPC. Despite treatment with high-dose steroids and intravenous immunoglobulin, her condition deteriorated, resulting in respiratory failure and death. IPIPC often lacks systemic symptoms and ANCA positivity, complicating diagnosis and treatment. Imaging, bronchoscopy, and histopathology are key for diagnosis, while management typically involves corticosteroids and possibly immunosuppressives. The case underscores the challenges in identifying and treating IPIPC, highlighting the importance of early intervention to improve prognosis, even though complications can still lead to significant respiratory issues and mortality.