Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: ET tube tip is 5 .1 cm from the carina . There is a left basilar opacity silhouetting the hemidiaphragm . Elsewhere , lungs are essentially clear besides left basilar atelectasis . Cardiac silhouette is mildly enlarged . Increased soft tissue density projecting over the AP window is compatible with patient 's known dissection with mediastinal hematoma . No acute osseous abnormalities .
    OUTPUT:
    
Left basilar opacity silhouetting the hemidiaphragm , potentially due to a combination of atelectasis and / or effusion . Abnormal mediastinal contour compatible with patient 's known mediastinal hematoma in setting of aortic dissection .