Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . On the lateral view , external artifact projects over the posterior thorax , partially obscuring the view . Given this , there is a left greater than right mild bibasilar atelectasis . No definite focal consolidation is seen . There is no pleural effusion or pneumothorax . The aortic knob is calcified . The cardiac silhouette is not enlarged .
    OUTPUT:
    
External artifact projects over the posterior chest on the lateral view , somewhat limiting its evaluation . Otherwise , aside from mild bibasilar atelectasis , no acute cardiopulmonary process seen .