Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Prior right - sided central venous catheter is no longer visualized . No large effusion identified noting resolution of prior moderate left - sided pleural effusion . Streaky retrocardiac opacity is most likely atelectasis . Superiorly , lungs are clear . Cardiomediastinal silhouette is within normal limits . Median sternotomy wires are intact . No acute osseous abnormalities .
    OUTPUT:
    
Left basilar opacity most likely atelectasis although infection is not entirely excluded . Consider PA and lateral if patient is amenable . Otherwise , no acute cardiopulmonary process .