Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A central venous catheter entering via an inferior approach terminates within the right atrium , unchanged . Cardiac , mediastinal and hilar contours are normal . Apart from minimal atelectasis in the lung bases likely due to low lung volumes , the lungs are clear without focal consolidation . No pleural effusion or pneumothorax is present . There is no pulmonary vascular congestion . Vascular stent is re - demonstrated within the right upper extremity . No acute osseous abnormalities are present .
    OUTPUT:
    
No definite radiographic evidence for pneumonia . Low lung volumes with mild bibasilar atelectasis .