Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest were obtained . Lung volumes are low , but unchanged compared to the prior study . Heart is not enlarged and cardiomediastinal contour is stable . Bibasilar streaky opacities likely relate to pulmonary vascular crowding from low lung volumes . Retrocardiac opacity is similar to the prior examination . There is no focal consolidation , pleural effusion , or pneumothorax .
    OUTPUT:
    
Low lung volumes with accentuated bronchovascular markings . Overall unchanged compared to the prior examination without evidence of acute intrathoracic abnormality .