Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . There is increased density projecting over the left hilum . This is thought to be due to superimposed atelectasis in the left lung given lack of significant change since ___ taking into account lower lung volumes and new elevation of left hemidiaphragm . Lungs are otherwise clear . Cardiomediastinal silhouette is within normal limits . No displaced rib fracture identified . Changes of DISH seen in the spine , unchanged .
    OUTPUT:
    
No definite acute cardiopulmonary process . No visualized displaced rib fracture . However , dedicated rib series can be performed if high clinical suspicion .