Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 14 : 16 is submitted .
    OUTPUT:
    
There is a persistent small to moderate right effusion with increasing airspace opacity more suggestive of atelectasis rather than an infectious process . Linear opacity in the left lower lung likely reflects scarring . There is no evidence of pulmonary edema . The heart remains enlarged which may reflect cardiomegaly or pericardial effusion . Clinical correlation is advised . No pneumothorax .