Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright view of the chest was reviewed and compared to the prior study . Blunting of the left lateral costophrenic sulcus has improved status post thoracentesis and elevated left hemidiaphragmatic contour could represent an elevated hemidiaphragm or a subpulmonic effusion . The lungs are clear without evidence of vascular congestion or pneumothorax . Unchanged mild cardiomegaly . Right impaced humeral head fracture is better characterized on dedicated shoulder radiograph from ___ .
    OUTPUT:
    
1 . Decreased left - sided pleural effusion status post thoracentesis with no pneumothorax . 2 . Elevated left hemidiaphragmatic contour could represent a subpulmonic effusion or true hemidiaphragmatic elevation . Left lateral decubitus radiograph could differentiate between these entities .