Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . The mediastinal and hilar contours appear unchanged . The lung volumes are low . There is a heterogeneous reticular abnormality which appears similar to perhaps minimally increased on the right side . Opacification is characterized by fine reticular opacities in a heterogeneous distribution , primarily suggestive of interstitial lung disease , although it is difficult to completely exclude a superimposed acute process . There are no definite effusions . No pneumothorax is seen .
    OUTPUT:
    
Findings suggesting interstitial lung disease . No definite acute superimposed process .