Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided dual lumen catheter in situ with its tip at the cavoatrial junction . No pneumothorax . Low lung volumes . Increase in atelectasis seen in the right mid lung zone as well as in the posterior basal aspects of the lower lungs with small associated effusions . The cardiomediastinal shadow is unchanged . Atherosclerotic changes of the aortic arch . Interrib ossification seen projecting over the left upper lobe . Small density seen in the right upper lobe unchanged . Contrast material seen subdiaphragmatic .
    OUTPUT:
    
The atelectasis seen in the right mid lung zone as well as in the posterior basal aspects of the lower zones shows mild interval progression . Small associated effusions .