TableĀ 3

Differential diagnosis for presenting symptoms of this patient

Differential diagnosisRadiographic findingsCT findings
Hypersensitivity pneumonitisLow 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 oedemaPeribronchial cuffing, septal (Kerley B) lines, interlobular fissure thickeningGGOs, interlobular septal thickening, bronchovascular bundle thickening
SarcoidosisMid and upper lobe predominant opacities, lymphadenopathy, calcified lymph nodesMid and upper lobe predominant reticulation, honeycombing, traction bronchiectasis, lymphadenopathy, calcified lymph nodes
Coronavirus disease 2019 (COVID-19)Bilateral lower lobe predominant airspace opacitiesBilateral lower lobe predominant ground glass and consolidative opacities
Mycoplasma pneumoniaeUnilateral or bilateral patchy consolidation, nodular or reticular opacitiesPatchy or ground-glass opacities, centrilobular nodules, tree-in-bud, bronchial wall thickening