Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . No radiopaque foreign body is seen in the chest . Overlying EKG leads are present . Lung volumes are somewhat low . There is no focal consolidation , effusion , or pneumothorax . The cardiomediastinal silhouette is stable with borderline cardiomegaly . Imaged osseous structures are intact .
    OUTPUT:
    
No acute intrathoracic process . No definite foreign body identified .