Clustered Cystic Changes in Long-Term Follow-Up Thin-Section Computed Tomographic Findings in Fibrotic Nonspecific Interstitial Pneumonia

Figure 1

Sequential HRCT scans in a 62-year-old man with fibrotic NSIP. (a) Initial CT scan shows irregular consolidation with traction bronchiectasis and bronchiolectasis (arrows). (b) Follow-up scan obtained 54 months later shows more traction bronchiolectasis and fine cystic lesions. Pathologic examinations showed not organizing pneumonia but airspaces-filling mucinous exudates. Consolidation was thought to be formed by prominent thickening of alveolar septa by collagen, volume loss of airspaces, and airspaces-filling mucinous exudate.

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