Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Cardiomegaly is mild . There is interval improvement in previously detected retrocardiac opacity . Currently there is no evidence of pneumonia or edema . No large effusion or pneumothorax . Mediastinal contour is unchanged . Bony structures are intact .
    OUTPUT:
    
Mild cardiomegaly , no signs of edema . Improved retrocardiac opacity .