Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable frontal upright chest radiograph demonstrates low lung volumes . Heart is enlarged . Cardiomediastinal contour is otherwise unremarkable . Calcifications are noted in the aortic arch . Lungs are clear . Blunting of the left costophrenic angle suggests a small pleural effusion . There is no pneumothorax .
    OUTPUT:
    
Cadiomegaly and small left pleural effusion without evidence of overt edema or pneumonia .