Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild increase in the right medial lung base and retrocardiac opacities , which may represent atelectasis , but can not exclude aspiration or pneumonia in the right clinical setting . Probable left pleural effusion . Mild cardiomegaly .
    OUTPUT:
    
Mild increase in the right medial lung base and retrocardiac opacities , which may represent atelectasis , but can not exclude aspiration or pneumonia in the right clinical setting .