Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mild to moderately enlarged . There is mild interstitial abnormality including mild cephalization of pulmonary vascularity suggesting slight vascular congestion . More focal patchy opacity obscures the cardiac borders and left hemidiaphragm in the left lower lung . It is difficult to exclude small pleural effusions . There is no pneumothorax .
    OUTPUT:
    
Findings suggesting mild vascular congestion . Focal patchy left basilar opacity , which may reflect atelectasis and potentially a subpulmonic pleural effusion , although an infectious etiology is not excluded .