Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly is stable . The mediastinal and hilar contours are normal . Mild prominence of the central vasculature is similar to ___ . There is some cephalization of vessels . Right lower lobe opacity is new and right atrium is enlarged compared to ___ . No pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Right lower lobe opacity may represent pneumonia . In order to exclude this , oblique views are needed . 2 . Right atrium is enlarged compared to ___ .