Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright frontal view of the chest . Normal lungs , heart and pleural surfaces . Lobulation of the mediastinal contour is due to an anterior mediastinal multicystic lesion which is better characterized on the prior chest CT .
    OUTPUT:
    
Given the mediastinal abnormality seen on the recent chest CT , the appearance of the mediastinum and lungs is without evidence of hemorrahge , pleural effusion or pneumothorax .