Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear bilaterally . The heart may be at the upper limit of normal , however there are low lung volumes and magnification artifact present ( AP film ) . No pleural effusion or pneumothorax is seen . On the lateral , a thin - walled ring shadow unlikely be of significance is seen .
    OUTPUT:
    
No radiographic evidence for the patient 's leukocytosis .