Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate to severe cardiomegaly is stable . Widening of the mediastinum is unchanged , probably due to enlargement of the main pulmonary arteries . Left PICC tip is in the lower SVC . There is no pneumothorax . . If any there is a small left effusion . Retrocardiac atelectasis are unchanged . There is no pulmonary edema .
    OUTPUT:
    
Retrocardiac opacities are a combination of atelectasis and small effusion Probably enlargement of the main pulmonary arteries