Case Presentation: Granulomatosis with Polyangiitis (GPA) is a rare necrotizing vasculitis characterized by chronic granulomatous inflammation and localized and systemic manifestations. It typically involves the upper airway, lungs, and kidneys, but potentially affects every organ with a highly variable clinical trajectory. Diffuse alveolar hemorrhage (DAH) is one of its least common pulmonary manifestations, characterized by [...]