Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to ___ , lung volumes are lower . There is an opacity at the left lung base , which may represent atelectasis although underlying pneumonia would be difficult to exclude based on this single view portable radiograph . Remainder of the lungs are otherwise clear . Prominence of the pulmonary vasculature is suggestive of mild vascular congestion . No overt pulmonary edema . No pneumothorax . Mild cardiomegaly is stable from at least ___ .
    OUTPUT:
    
1 . Left retrocardiac consolidation may represent atelectasis or pneumonia . A conventional PA and lateral chest radiograph is recommended for confirmation . 2 . Mild cardiomegaly and pulmonary vascular congestion .