Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart appears mildly enlarged . There is a dense retrocardiac opacity with air bronchograms , suggesting pneumonia . There are also more patchy streaky right basilar opacities . In addition , central pulmonary arteries are mildly prominent with upper zone redistribution , suggestive of mild fluid overload . Small pleural effusions are difficult to exclude . There is no pneumothorax . The bones are probably demineralized . There is mild leftward convex curvature centered along the mid lumbar spine .
    OUTPUT:
    
Dense retrocardiac opacity in the left lower lobe , worrisome for pneumonia .