Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged . Aortic knob is calcified . The mediastinal and hilar contours otherwise are unremarkable , and no pulmonary vascular congestion is present . Lungs are clear without focal consolidation . No pleural effusion or pneumothorax is present . There are low lung volumes noted . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary process . Mild cardiomegaly .