Immunoglobulin G4-related lung disease mistaken for pulmonary tuberculosis: A case report

Figure 1 Pathological assessment showed localized fibrous tissue hyperplasia and extensive plasma cell infiltration.

Figure 2 A total of 30-40 immunoglobulin G4-positive cells per high-power field, and an immunoglobulin G4/immunoglobulin G ratio of 40%.

Figure 3 Axial unenhanced thoracic computed tomography. A: Before treatment. Showing distal bronchial distension and traction bronchiectasis (orange arrow), glass opacities (yellow arrow) and a mass in the right superior lobe (black arrow); B: Computed tomography (CT) scan showing that the mass had shrunk and the ground-glass lesions had cleared after 2 months of corticosteroid therapy (35 mg/day oral prednisolone and mycophenolate mofetil 0.5 g bid); C: Chest CT scan at 6 months of treatment showing that the mass had shrunk further; D: Chest CT obtained 1 year after treatment. Chest CT shows that only cord-like shadows remained.