Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . There is a layering right pleural effusion , small to moderate in size with associated compressive lower lobe atelectasis . Difficult to exclude an underlying pneumonia . The left lung is clear . Hila appear somewhat congested . No overt pulmonary edema . The heart is moderately enlarged . Mediastinal contour is normal . Imaged osseous structures appear intact .
    OUTPUT:
    
Moderate cardiomegaly with hilar congestion and moderate right pleural effusion . Compressive right lower lung atelectasis , difficult to exclude pneumonia .