Fig. 2

1A, B A 55-year-old male patient complaining of progressive dyspnea with restrictive pulmonary functions; 1A X-ray chest PA view, 1B Axial chest CT (lung window); both showing extensive fibrotic changes and honeycombing bronchiectasis, more pronounced in lower lung zones. Diagnosis: Proved patient with UIP/IPF. 2A, B A 53-year-old female patient with a history of rheumatoid arthritis who was complaining of progressive dyspnea (2A, B) Axial chest CT (lung window); both showing bilateral lower lobar mosaic ground-glass attenuation (orange colored arrows) mixed with peri-bronchial thickening and traction bronchiectasis/bronchiolectasis (blue colored arrows) without honeycombing. Diagnosis: Proved patient with fibrosing NSIP. 3A, B A 43-year-old female patient complaining of progressive dyspnea with a positive history of raising birds. 3A Axial chest CT (lung window) showing “head-cheese sign” (red colored squares) and fine septal thickening (blue colored arrow). 3B Axial chest CT (lung window) showing faint centrilobular ground glass nodules (example: orange colored square). Diagnosis: Proved patient with mixed sub-acute and chronic hypersensitivity pneumonitis (HP)