Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette is mildly enlarged . Main pulmonary artery is enlarged as demonstrated on prior CTA of the chest . Lungs and pleural surfaces are clear . No acute skeletal findings .
    OUTPUT:
    
Cardiomegaly and central pulmonary artery enlargement . The patient has known cardiac chamber enlargement as well as a patent foramen ovale as reported on recent echo .