Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable , allowing for differences in technique , including mild - to - moderate cardiomegaly . There is no pleural effusion or pneumothorax . A new focal perihilar opacity in the left upper lobe could be seen with pneumonia but not specific . Remodeled fractures of the right posterior ninth and tenth ribs appear old . The bones appear demineralized . There is mild chronic appearing loss in height among several lower thoracic vertebral bodies .
    OUTPUT:
    
Opacity in the left upper lobe . It is fairly typical for pneumonia , but other etiologies such as contusion could be considered in the appropriate clinical setting . Follow - up radiographs are recommended to show resolution within eight weeks .