Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable AP chest radiograph demonstrates clear lungs bilaterally . No focal opacity convincing for pneumonia is identified . Cardiomediastinal and hilar contours are within normal limits . There is no evidence of pulmonary edema . No large pleural effusion is present . There is no pneumothorax . Visualized osseous structures are unremarkable .
    OUTPUT:
    
No acute intra thoracic abnormality . No evidence of pulmonary edema .