Differential diagnosis for presenting symptoms of this patient
| Differential diagnosis | Radiographic findings | CT findings |
| Hypersensitivity pneumonitis | Low sensitivity, with many patients having normal radiographs Findings may include: nodular opacities, GGOs or consolidation, fine reticulation, eventual fibrosis with honeycombing | Mid and upper lobe predominance, centrilobular nodules, bilateral and symmetric airspace opacities (ground glass or consolidation), air trapping with mosaic pattern, head cheese sign, fibrosis with honeycombing |
| Pulmonary interstitial oedema | Peribronchial cuffing, septal (Kerley B) lines, interlobular fissure thickening | GGOs, interlobular septal thickening, bronchovascular bundle thickening |
| Sarcoidosis | Mid and upper lobe predominant opacities, lymphadenopathy, calcified lymph nodes | Mid and upper lobe predominant reticulation, honeycombing, traction bronchiectasis, lymphadenopathy, calcified lymph nodes |
| Coronavirus disease 2019 (COVID-19) | Bilateral lower lobe predominant airspace opacities | Bilateral lower lobe predominant ground glass and consolidative opacities |
| Mycoplasma pneumoniae | Unilateral or bilateral patchy consolidation, nodular or reticular opacities | Patchy or ground-glass opacities, centrilobular nodules, tree-in-bud, bronchial wall thickening |