Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Median sternotomy wires appear intact . Surgical clips project over the mediastinum and left upper quadrant . Lung volumes are normal . Faint opacities at the left base partially obscuring the left hemidiaphragm may reflect atelectasis or pneumonia . No pleural effusion or pneumothorax . Heart size is normal . The aorta is calcified and unfolded . S - shaped curvature of the thoracolumbar spine is re-demonstrated .
    OUTPUT:
    
Possible atelectasis , aspiration or pneumonia at the left base . Recommend followup radiographs to ensure resolution of this finding .