Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP upright portable view of the chest was obtained . Mediastinal surgical clips are seen . There is also evidence of a coronary artery stent . The cardiac silhouette remains mildly enlarged . Opacity projecting over the left costophrenic angle may be due to overlying soft tissue and cardiac silhouette , although a small pleural effusion is difficult to exclude . No large pleural effusion is seen . There is no definite consolidation or evidence of pneumothorax . Mediastinal contours are stable .
    OUTPUT:
    
Opacity projecting over left costophrenic angle most likely relating to overlying soft tissue , although a small left pleural effusion is difficult to exclude . No large pleural effusion seen . Otherwise , no acute cardiopulmonary process .