Interstitial lung disease: Which combination describes typical findings on CT and pulmonary function tests?

Interstitial lung disease: Which combination describes typical findings on CT and pulmonary function tests?

• A. M > 40 years smoker; reticular opacities with honeycombing and ground-glass on CT; reduced lung volumes; increased FEV1/FVC
• B. Young non-smoker with lobar consolidation
• C. Immunocompromised with nodular cavitations
• D. Acute bronchitis pattern

Answer: (A)

Interstitial lung disease typically presents with a restrictive physiology and characteristic CT patterns. On CT, you look for reticular opacities, honeycombing, and often ground-glass changes that reflect fibrosis and interstitial inflammation. On pulmonary function testing, this usually shows reduced lung volumes (lower FVC and total lung capacity) with the FEV1 reduced to a similar extent, so the FEV1/FVC ratio is normal or increased due to the restrictive pattern. The described scenario—a patient over 40 who smokes with those CT findings and reduced volumes plus a normal-to-elevated FEV1/FVC ratio—best fits this pattern. Other options describe findings more typical of infectious consolidation, nodular cavitations in immunocompromised hosts, or acute bronchitis, which do not align with the fibrotic, restrictive changes of ILD.

Interstitial lung disease typically presents with a restrictive physiology and characteristic CT patterns. On CT, you look for reticular opacities, honeycombing, and often ground-glass changes that reflect fibrosis and interstitial inflammation. On pulmonary function testing, this usually shows reduced lung volumes (lower FVC and total lung capacity) with the FEV1 reduced to a similar extent, so the FEV1/FVC ratio is normal or increased due to the restrictive pattern. The described scenario—a patient over 40 who smokes with those CT findings and reduced volumes plus a normal-to-elevated FEV1/FVC ratio—best fits this pattern. Other options describe findings more typical of infectious consolidation, nodular cavitations in immunocompromised hosts, or acute bronchitis, which do not align with the fibrotic, restrictive changes of ILD.