Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart appears mildly enlarged . The mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . Particularly well visualized on the lateral view is a posterior infrahilar opacification which may be associated with bronchopneumonia but noting low lung volumes , atelectasis could be considered .
    OUTPUT:
    
Posterior basilar opacities which are probably in the left lower lobe and likely attributed to minor atelectasis . If infection is suspected clinically then short - term radiographs could be considered for followup , however .