Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . No focal opacity to suggest pneumonia is seen . No pleural effusion , pulmonary edema , or pneumothorax is present . The heart size is within normal limits given positioning . Posterior cervical spinal fusion hardware appears intact though alignment is not well evaluated and better seen on CT of the same date . There is partially imaged lumbar spinal fusion hardware . No displaced fracture is identified . A known C2 fracture is not evaluated on this examination .
    OUTPUT:
    
No evidence of acute intrathoracic process .