Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable AP upright image of the chest was obtained . There are low lung volumes and resultant bibasilar atelectasis . Superiorly the lungs are clear bilaterally without focal consolidation or pulmonary edema . The previously described right pleural effusion has decreased in size . No pneumothorax . There are no bony abnormalities . There is no free air below the right hemidiaphragm . Prominent air filled bowel loops are located below the left hemidiaphragm .
    OUTPUT:
    
No acute intrathoracic process . Interval decrease in right pleural effusion .