Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable frontal chest radiograph demonstrates hypoinflated lungs with bilateral lower lobe atelectasis and crowding of vasculature . Limited evaluation of heart size due to patient positioning and low lung volumes . Mediastinal contour and hila are unremarkable . Possible tiny left pleural effusion . No pneumothorax . Limited assessment of the upper abdomen is within normal limits .
    OUTPUT:
    
1 . Low lung volumes with bibasilar patchy opacities favoring atelectasis . PA and lateral chest radiographs with improved inspiratory level may be helpful for more complete assessment as a differential diagnosis includes aspiration and early pneumonia .