Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and mitral valve replacement . Right - sided Port - A - Cath tip terminates in the low SVC . Mild cardiomegaly is unchanged . The mediastinal and hilar contours are per similar . There is no pulmonary edema . Patchy airspace opacities are noted in the lung bases , new from the previous study , worrisome for multifocal pneumonia or aspiration . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Bibasilar airspace opacities concerning for multifocal pneumonia or aspiration .