Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chest , PA and lateral . The lung volumes are low causing crowding of the pulmonary vasculature at the bases . The hilar and cardiomediastinal contours are normal . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal .
    OUTPUT:
    
Crowding of vasculature at the bases due to low lung volumes makes it difficult to differentiate between microatelectasis and mild interstitial abnormality .