Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . Postoperative changes of left lower lobectomy are again noted . Left pleural effusion with fluid tracking just lateral to the posterior mediastinum again seen , similar to CT scan . The lungs are otherwise clear without consolidation or pulmonary vascular congestion . Cardiomediastinal silhouette is stable as are the osseous structures .
    OUTPUT:
    
No acute cardiopulmonary process .