Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged , but probably unchanged . Aortic knob is again calcified and slightly unfolded . Lung volumes are slightly low which accentuates bronchovascular markings . This likely accounts for changes seen lower lobe on lateral view . No CHF , focal consolidation , pleural effusion or pneumothorax detected . Shin degenerative change versus old healed fracture of the left humeral head .
    OUTPUT:
    
Mild cardiomegaly , unchanged . No acute pulmonary process identified .