Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The aorta is moderately tortuous . Otherwise , the mediastinal and hilar contours appear unchanged . There is patchy opacification within each costophrenic sulcus suggestive of minor atelectasis , as well as left infrahilar retrocardiac opacity concerning for a focus of bronchopneumonia . There is no pleural effusion or pneumothorax . The bones are probably demineralized . Mild degenerative changes are similar along the mid thoracic spine .
    OUTPUT:
    
Bronchovascular opacity in the retrocardiac region concerning for bronchopneumonia .