Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . A prosthetic mitral valve is noted . Bibasilar opacities are again seen most compatible with pleural effusions . Underlying consolidation is difficult to exclude . Overall there has been minimal improvement from the prior exam No pneumothorax is seen . The mediastinal contour is stable . Bony structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Marginal improvement in bilateral small pleural effusions and bibasilar atelectasis / consolidation .