Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright and lateral chest radiographs were obtained . Examination is limited due to poor penetration and low lung volumes . No focal consolidation , pleural effusion or pneumothorax is identified . The heart is enlarged with otherwise normal mediastinal and hilar contours .
    OUTPUT:
    
Limited study without acute intrathoracic process .