Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal portable view of the chest demonstrates low lung volumes , which accentuate bronchovascular markings . Moderate pulmonary edema appears progressed from prior exam . Left costophrenic angle is obscured , suggestive of a small pleural effusion . Left hemidiaphragm is poorly visualized due to a lung base opacity . Hilar and mediastinal silhouettes are unchanged . Moderate cardiomegaly is slightly increased from the prior study . Partially imaged upper abdomen is unremarkable .
    OUTPUT:
    
1 . In comparison to ___ exam , there is worsening congestive heart failure with moderate pulmonary edema , small left pleural effusion , and increased size of the cardiac silhouette . 2 . Left lung base opacity obscuring left hemidiaphragm likely represents atelectasis or infection in appropriate clinical setting .