Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The inspiratory lung volumes are decreased from the most recent prior study . Biapical lucency is unchanged , compatible with bullous emphysema . Prominent perihilar interstitial lung markings bilaterally are similar in comparison to the prior chest radiograph of ___ but not seen on earlier prior studies . There is no pleural effusion or pneumothorax . The cardiomediastinal and hilar contours are within normal limits . No acute osseous abnormality is detected .
    OUTPUT:
    
Bilateral perihilar interstitial prominence may represent pulmonary vascular congestion / interstitial edema although atypical infection is not excluded .