CTICasesAcute interstitial pneumonia (AIP) progressing to chronic fibrosis
Imaging findings
Initial CT shows diffuse alveolar damage (DAD) with airspace consolidation and ground-glass opacities. Serial follow-up CT scans show transition to a chronic fibrotic phase characterized by traction bronchiectasis and honeycombing in a UIP-like pattern.
Key takeaways
AIP is a rapidly progressive form of DAD of unknown etiology. Survivors of the acute exudative and organizing phases can develop progressive, irreversible pulmonary fibrosis that radiographically and histologically resembles UIP.
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