Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright portable view of the chest was obtained . Evaluation of the lung bases is slightly suboptimal due to underpenetration , particularly at the left costophrenic angle due to patient body habitus , as was also the case on the prior study . Given this , no focal consolidation , large pleural effusion , or evidence of pneumothorax is seen . The cardiac silhouette remains enlarged . Mediastinal and hilar contours are stable .
    OUTPUT:
    
No definite acute cardiopulmonary process given limitations as above . Persistent enlargement of the cardiac silhouette .