Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right lung base airspace opacities appear new from prior studies and may represent atelectasis , aspiration , or early pneumonia . Bilateral upper lobe predominant reticular opacities are grossly unchanged from prior studies suggests the possibility of chronic lung disease such as hypersensitivity pneumonitis or sarcoidosis . . There is no pleural effusion , pulmonary edema , or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
New right lung base airspace opacity may represent atelectasis , aspiration , or early pneumonia .