Predominant Pattern & or Distribution

Mosaic Attenuation

Additional Findings

Small vessels in low attenuation areas, larger vessels in high attenuation areas; Air-trapping on expiratory images

The differential for small airway disease causing air tapping includes bronchiolitis obliterans syndrome, DIPNECH (diffuse idiopathic pulmonary neuroendocrine cell hyperplasia,) subacute/chronic hypersensitivity pneumonitis

DDX

Etiology

Constrictive Bronchiolitis post-lung transplant.