Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . This accentuates the size of the cardiac silhouette which is likely mild to moderately enlarged . There is apparent widening of the superior mediastinum which could be due to low lung volumes . The mediastinal contours are otherwise smooth . The pulmonary vascularity is normal and the lungs are clear . No focal consolidation , pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes . Apparent widening of the superior mediastinum may be due to low lung volumes or mediastinal lipomatosis , however if there is concern for trauma to the chest , a CTA of chest should be performed for further evaluation . Mild - to - moderate cardiomegaly .