Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is indistinctness of the aortic knob , and elevated right pulmonary artery , and an enlarged left pulmonary artery suggestive of a developmental mediastinal anomaly or , alternatively , lymphadenopathy . Heart size is normal . Lungs are fully expanded and clear without focal consolidations or suspicious pulmonary nodules . No pleural abnormalities . Incidental note is made of a gastric band in the left upper quadrant .
    OUTPUT:
    
Mediastinal abnormalities described above may reflect a developmental mediastinal anomaly or , alternatively , lymphadenopathy . Correlation with prior chest imaging may be helpful , if available .