Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . There is no consolidation or edema . Previously seen left basilar opacity from exam 2 days prior has resolved . Trace left pleural effusion remains . Median sternotomy wires are intact . Mediastinal clips are again noted . No acute osseous abnormalities .
    OUTPUT:
    
Trace residual left pleural effusion . Otherwise , no acute cardiopulmonary process .