Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . There is subtle increased interstitial opacity identified at the right lung base likely within the right middle lobe based on the lateral exam . Superiorly , the lungs are clear . Cardiomediastinal silhouette is within normal limits . Osseous and soft tissue structures are unremarkable .
    OUTPUT:
    
Relatively subtle right basilar opacity which is slightly more conspicuous when compared to prior , potentially atelectasis however could be secondary to pneumonia in the proper clinical setting .