“ Previously known as bronchiolitis obliterans organising pneumonia. It is characterised by the onset of cough, dyspnoea and low-grade pyre...
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Previously known as bronchiolitis obliterans organising pneumonia. It is characterised by the onset of cough, dyspnoea and low-grade pyrexia over several weeks. Wide age range affected, more common between 40 and 70 years of age.
Plain film
• Bilateral, peripheral patchy consolidation.
• Fleeting/migratory consolidation is classic.
HRCT
• Typically multifocal, transient, patchy, dense consolidation with a predominantly sub-pleural, midlower zone distribution (80%).
• Small centrilobular nodules and peribronchial thickening.
• The ‘atoll’ sign is characteristic (not pathognomic), lesion with central ground glass and rim of consolidation.
• Adenopathy (25%) and effusions (30%) are less common.
• Dense consolidation helps to distinguish COP from desquamative interstitial pneumonia (DIP)— ground-glass opacification dominates in DIP
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