Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and mitral valve replacement . Severe cardiomegaly is unchanged . The aorta is tortuous . There is mild pulmonary vascular engorgement which appears chronic . Streaky bibasilar airspace opacities most likely reflect atelectasis . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Severe cardiomegaly with chronic mild pulmonary vascular congestion . Bibasilar atelectasis .