Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable including mild - to - moderate cardiomegaly . There is unchanged double contour to the right hemidiaphragm . Although difficult to completely exclude , there are no definite pleural effusions . There is no pneumothorax . Retrocardiac opacity has improved . Right basilar opacity has also improved . There is mild coarsening of lung markings , but not necessarily an acute finding . Patchy left mid lung opacities suggest residual atelectasis . The patient is status post incompletely characterized cervical fusion . The patient is also status post right shoulder replacement .
    OUTPUT:
    
Improved bibasilar opacities . Similar mild interstitial process ; chronic vascular congestion or airway inflammation could account for this appearance .