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An 8-year-old boy with fever and dyspnoea. a An axial non-contrast chest CT shows peripheral tree in bud mostly in the right lower lobe (circles) and middle lobe either representing vasculitis from direct damage to the pulmonary vascular endothelium or exudative bronchiolitis due to hypersecretion/bacterial superimposed infection. b Magnification view of the right lower lobe findings
