Match each interstitial and diffuse parenchymal lung disease with its most characteristic high-resolution computed tomography (HRCT) imaging pattern.
- Idiopathic pulmonary fibrosisHeterogeneous, basal and subpleural predominant reticular opacities, traction bronchiectasis, and clustered cystic airspaces with thick walls, typically without significant ground-glass opacification
- Idiopathic nonspecific interstitial pneumoniaHomogeneous, basilar predominant ground-glass opacities with fine reticulation and volume loss, often exhibiting immediate subpleural sparing without macroscopic cystic spaces
- Cryptogenic organizing pneumoniaPatchy, migratory consolidation in a peripheral and peribronchovascular distribution, occasionally demonstrating a central area of ground-glass opacity surrounded by a denser ring of consolidation
- Fibrotic hypersensitivity pneumonitisUpper and mid-lung zone predominant fibrosis, ground-glass opacities, and ill-defined centrilobular micronodules, often accompanied by lobular areas of decreased attenuation on expiratory imaging
- Pulmonary alveolar proteinosisExtensive bilateral ground-glass attenuation with superimposed thickened interlobular and intralobular septa, characteristically sharply demarcated from adjacent normal lung parenchyma
Answer
Idiopathic pulmonary fibrosis matches with basal/subpleural honeycombing and reticular opacities. Idiopathic nonspecific interstitial pneumonia matches with basilar ground-glass opacities and subpleural sparing. Cryptogenic organizing pneumonia matches with patchy peripheral consolidation and the reverse halo sign. Fibrotic hypersensitivity pneumonitis matches with upper/mid-lung fibrosis, centrilobular micronodules, and mosaic attenuation. Pulmonary alveolar proteinosis matches with the crazy-paving pattern.
The correct pairings rely on recognizing the standardized radiologic criteria for interstitial lung diseases. Idiopathic pulmonary fibrosis requires a Usual Interstitial Pneumonia (UIP) pattern, identified by honeycombing and subpleural/basal predominance. NSIP lacks honeycombing, features uniform ground-glass opacities, and often spares the immediate subpleura. Fibrotic hypersensitivity pneumonitis is distinguished by its 'three-density pattern' (headcheese sign) and upper-lung predominance. COP presents with consolidative changes, often migrating, with the reverse halo sign. PAP is the classic cause of the extensive crazy-paving pattern without fibrosis.
Step-by-Step Solution
Key Concept
High-Resolution Computed Tomography (HRCT) patterns are highly specific for differentiating various diffuse parenchymal and interstitial lung diseases based on spatial distribution and pathognomonic parenchymal signs.
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