Case Presentation: Microscopic polyangiitis (MPA) is a rare form of small-vessel vasculitis strongly associated with antineutrophil cytoplasmic antibodies (ANCA), particularly myeloperoxidase (MPO-ANCA). While the kidneys are the most commonly affected organ, MPA can also present with pulmonary involvement, manifesting as interstitial lung disease (ILD). This presentation is particularly challenging to diagnose in older adults, as [...]