Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph provided . Midline sternotomy wires are noted . Lung volumes are low . The heart appears enlarged , though this is unchanged . Mild atelectatic changes are noted bilaterally . No large effusion or pneumothorax . No convincing signs of edema or pneumonia . Chronic deformities of the shoulders again noted .
    OUTPUT:
    
Cardiomegaly . Otherwise unremarkable .