Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable including unfolding of the thoracic aorta . The right upper mediastinal contour as well as the right lung apex are obscured by chin flexion , however . There is probably a trace pleural effusion on the right only . The lungs appear clear within the limitations of technique . Prior open reduction and fixation of the lower of thoracic and upper lumbar spines is incompletely characterized but involves placement of a fusion cage without obvious change . A moderate mid to lower compression deformity along the lower thoracic spine is probably unchanged .
    OUTPUT:
    
Limited examination , but no evidence of pneumonia .