Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are probable hyperinflated . There is moderate to moderately severe cardiomegaly . There is upper zone redistribution , without other evidece of CHF . On the right , there is pleural fluid and / or thickening , with underlying patchy opacity . Undulating vertical linear opacity along the right chest wall is thought to represent some scarring and / or calcification along the pleural - parenchymal interface . On the left , there is slight retrocardiac opacity . No left effusion . A well - marginated right hilar opacity likely represenrs an enlarged right pulmonary artery . The left hilum is obscured by overlying structures , but not clearly enlarged . Partially imaged left shoulder prosthesis noted .
    OUTPUT:
    
1 . Right base and retrocardiac opacity concerning for pneumonia and / or atelectasis , with associated small right pleural effusion . This is of indeterminate acuity . Probable scarring at the pleural - parenchymal interface along the right chest wall -- has there been prior trauma or instrumentation ? 2 . Moderate to moderately severe cardiomegaly . 3 . Right hilar enlargement -- please see comment above .