Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A tracheostomy tube projects over the trachea in appropriate position on this single view . A left pectoral pacemaker with a single lead terminating in the right ventricle is present . The inspiratory lung volumes are decreased . There is opacification of the right lower lung zone obscuring the right heart border and right hemidiaphragm , suggesting a small right pleural effusion . There is probable elevation of the right hemidiaphragm with air - filled colon projecting over the expected right lung base . The left lung is relatively clear with streaky retrocardiac opacification most compatible with atelectasis . No pneumothorax is detected . The cardiac silhouette is incompletely evaluated due to right basilar opacification but is likely mildly enlarged . The mediastinal contours are prominent in part related to unfolding of the thoracic aorta . The aortic knob is partially calcified .
    OUTPUT:
    
Right pleural effusion with possible elevation of the right hemidiaphragm and air-filled colon projecting over the expected right lung base beneath the elevated hemidiaphragm .