Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Persistent widening of cardiomediastinal contours . Prominent rounded contour in the subcarinal region may reflect an enlarged left atrium , but other mediastinal mass such as bronchogenic cyst could produce a similar appearance . Mild pulmonary vascular congestion is accompanied by minimal perihilar edema . Patchy atelectasis is present at right lung base adjacent to an elevated right hemidiaphragm .
    OUTPUT:
    
Cardiomegaly and mild edema . Round cardiomediastinal contour in subcarinal region could be due to left atrial enlargement or other mediastinal process such as a bronchogenic cyst . Chest CT may be helpful for more complete evaluation . Dr . ___ has been telephoned with this result on ___ at 8 :30 a .m .