Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral chest radiograph demonstrate stable cardiomediastinal and hilar contours . There is no evidence of pulmonary edema . There is no pleural effusion or pneumothorax . Lungs are clear without a focal opacity convincing for pneumonia . A left shoulder arthroplasty is partially imaged . Degenerative changes are moderate to severe involving the right shoulder joint .
    OUTPUT:
    
No acute intrathoracic abnormality .