Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . Moderate cardiomegaly is unchanged . The mediastinal contours are stable with calcification of the thoracic aorta which is mildly tortuous . There is mild pulmonary vascular congestion unchanged from the radiograph performed earlier in the day . Streaky opacities in lung bases are re- demonstrated . No pleural effusion or pneumothorax is identified . Evaluation the osseous structures is limited due to the patient 's large body habitus . Partially imaged is orthopedic hardware within the right humeral head .
    OUTPUT:
    
Mild pulmonary vascular congestion unchanged compared to the radiograph from earlier in the day . Bibasilar airspace opacities could reflect areas of infection but are improved from ___ .