Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Underpenetration limits assessment . The heart appears mildly enlarged . Mild edema difficult to exclude . Left lung base poorly assessed . No large effusion is seen . No pneumothorax . Bony structures appear grossly intact .
    OUTPUT:
    
Limited exam with mild cardiac enlargement , possible mild edema .