Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . There is unchanged appearance of the left base . While some of this density may be accounted for by elevated hemidiaphragm , there is also increased retrocardiac opacity . Left effusion is suspoected given presence on prior with similar appearance on the frontal view . Mild cardiomegaly is also stable from prior . There is no pneumothorax . No mediastinal widening is identified .
    OUTPUT:
    
Stable mild cardiomegaly . Left base opacity as described above and similar to prior . Suspect underlying effusion and atelecatsis although infection is not excluded . Consider PA and lateral views to further charcterize when patient is amenable .