Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . A mild diffuse interstitial abnormality is unchanged in the background . The main change is that there is new mild elevation of the left hemidiaphragm with streaky retrocardiac opacities . It is difficult to exclude pleural effusions , although none are definitively shown . There is no pneumothorax .
    OUTPUT:
    
New retrocardiac opacity in the left lower lobe with mild volume loss . Although the appearance could potentially be explained by atelectasis , pneumonia or aspiration could be considered for this appearance and short - term followup radiographs , preferably with PA and lateral technique , may be helpful to assess further if clinically indicated .