Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs demonstrate clear lungs bilaterally . There is no pleural effusion . Cardiomediastinal and hilar contours are within normal limits .
    OUTPUT:
    
Normal heart , lungs , hila , mediastinum , and pleural surfaces . No evidence of intrathoracic malignancy or infection . .