Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Underpenetration of the film limits assessment . The appearance of mild to moderate cardiomegaly may be in part due to low lung volumes and AP technique . The mediastinal contours are stable . There is no pleural effusion or pneumothorax . There is no focal consolidation concerning for pneumonia . Pulmonary vasculature is within normal limits .
    OUTPUT:
    
Low lung volumes . No acute cardiopulmonary process .