Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph is obtained . Midline sternotomy wires are again noted . There are bilateral pleural effusions , left greater than right with associated atelectasis in the lower lungs . Otherwise the lungs appear clear . Cardiomediastinal silhouette is stable . Bony structures are intact .
    OUTPUT:
    
Small bilateral pleural effusions , left greater than right with associated lower lobe compressive atelectasis .