Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable AP semi-upright view of the chest was obtained . Allowing for differences in technique and positioning , mild cardiomegaly is probably stable . Apparent widening of the mediastinum may also relate to the technique . Lungs are clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Apparent increase in cardiac size and widening of the mediastinum likely relates to the portable technique and patient positioning . 2 . Mild cardiomegaly .