Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . The lung volumes are low . Within the limitations of technique , there is no definite acute abnormality . Patchy opacity in the right lower lung , probably in the right lower lobe , is likely due to minor atelectasis . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Right basilar opacity , probably due to atelectasis . Low lung volumes . Follow - up radiographs could be considered if the possibility of developing infection is a strong persistent clinical concern , although doubtful .