Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomegaly is moderate and unchanged . There is improved aeration of the lung bases compared with prior . No signs of pneumonia , pleural effusion , CHF , or pneumothorax . Mediastinal contour is stable with atherosclerotic calcifications again noted along the aortic knob . Bony structures are intact . No free air below the right hemidiaphragm . Clips are again noted in the upper abdomen .
    OUTPUT:
    
No acute intrathoracic process . Stable moderate cardiomegaly .