Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP frontal view of the chest was obtained . Minimal retrocardiac opacity is most likely due to atelectasis in the setting of low lung volume . Underlying consolidation due to infection or aspiration is not excluded . Consider dedicated PA and lateral views if patient able for further evaluation . Increased interstitial markings consistent with patient 's known interstitial lung disease are grossly stable . No large pleural effusion is seen . There is no pneumothorax . The mediastinal silhouettes are stable . Cardiac silhouette appears slightly more prominent compared to the prior study , although this can be due to differences in inspiration and position .
    OUTPUT:
    
Subtle patchy left base retrocardiac opacity could be due to atelectasis ; however , consolidation is not excluded in the appropriate clinical setting . If patient able , consider PA and lateral views for further evaluation .