Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart continues to be mildly enlarged . Bulging contour at the AP windowis in part due to enlarged pulmonary artery and prominent mediastinal fat . There are low lung volumes without focal consolidation , pleural effusion or pulmonary edema . Atherosclerotic calcifications are again noted at the aortic knob .
    OUTPUT:
    
Cardiomegaly . Low lung volumes without focal consolidation .