Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP upright portable view of the chest was obtained . Again , there is diffuse increase in interstitial markings , similar as compared to prior but new since ___ , could be due to viral or atypical pneumonia . No lobar consolidation is seen . There is no evidence of pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Diffuse increase in interstitial markings similar to prior , possibly slightly decreased in the right upper ___ , ___ be due to viral or atypical infection .