Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low . Mild cardiomegaly persists . The aorta remains tortuous . Widening of the superior mediastinal contour is unchanged . Pulmonary vasculature is not engorged . There is no focal consolidation , pleural effusion or pneumothorax . Atelectasis is noted in the lung bases . There are no acute osseous abnormalities .
    OUTPUT:
    
No radiographic evidence for pneumonia . Unchanged widening of the superior mediastinal contour from ___ . While this could be due to the presence of mediastinal fat , underlying lymphadenopathy or mass is not completely excluded . Consider further assessment with CT of the chest .