Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate mildly low lung volumes , accentuating the pulmonary vasculature and cardiac contour . Otherwise , the lungs are clear with no focal infiltrate or pleural effusion . No pneumothorax is appreciated . The cardiac contour is mildly enlarged although stable since the prior study .
    OUTPUT:
    
No acute intrathoracic process . Mild - to - moderate cardiomegaly .