Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Evaluation is limited due to patient body habitus . However , there is an increased opacity in the retrocardiac region . Mild right basal atelectasis identified . The cardiomediastinal silhouette is moderately enlarged . No acute fractures are identified .
    OUTPUT:
    
1 ) Limited study due to patient body habitus demonstrates increased retrocardiac opacity . This is likely atelectasis , however , pneumonia must be excluded in the proper clinical setting . A lateral view may be obtained for further characterization . 2 ) Moderate cardiomegaly .