Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrates clear lungs bilaterally . Left parahilar opacity likely reflects superimposed structures . There is no pleural effusion , pulmonary edema , or pneumothorax . There is no air under the right hemidiaphragm .
    OUTPUT:
    
No acute intrathoracic abnormality .