Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Median sternotomy wires are again noted . There has been interval removal of a right PICC line . Mediastinal contours are stable , and heart size is normal . Again seen is opacification of the left lower lung , representing a combination of elevated left hemidiaphragm , atelectasis , and small effusion . Otherwise , diffuse patchy opacities throughout the lung fields have improved .
    OUTPUT:
    
No acute findings .