“… 2 The radiological pattern of presentation can be remarkably diverse: localized parenchymal involvement, diffuse parenchymal involvement, presence of lymphadenopathy, diffuse interstitial pattern, bronchial thickening and pulmonary nodules, as in our case. 3 In terms of laboratory tests, elevated serum levels of total IgG (61% > 1800 mg/dl), IgG4 (84% > 135 mg/dl) and IgE (58% > 360 mg/dl ) stand out. It may even be positive for anti-neutrophil cytoplasmic antibodies.…”