Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to most recent radiograph , there is suboptimal inspiration , which contributes to low lung volumes , increased vascular crowding in the bases , and increased silhouetting of the heart and mediastinum . Allowing for this , there is no substantial change in the increased interstitial markings which persist suggesting possible viral pneumonia or chronic interstitial lung disease . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Persistence of increased interstitial markings may be due to an infectious etiology , likely viral , or chronic interstitial lung disease . Follow - up in ___ weeks for documentation of resolution is reccomended