Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left PICC line terminates in the right atrium . Prosthetic mitral valve is in place . Small right pleural effusion is unchanged although there are a mild increase in atelectasis at the right base . Small left pleural effusion is smaller since the study 1 .5 hr earlier . The cardiomediastinal silhouette is unchanged . There is no pneumothorax .
    OUTPUT:
    
Small left pleural effusion is smaller since the study 1 .5 hr prior . There is no pneumothorax .