Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . While no definite focal consolidation is seen on the frontal view , question of posterior basal opacity on the lateral view is seen which could be due to atelectasis or infection . No pleural effusion or pneumothorax . Cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
While not substantiated on the frontal view , question of posterior basal opacity on the lateral view could be due to atelectasis or infection .