Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low . No focal consolidation , edema , effusion , or pneumothorax . The cardiomediastinal silhouette is unremarkable . No acute osseous abnormality . A large , round opacity projecting in the right upper quadrant over the expected region of the gallbladder may represent a known large gallstone on recent ultrasound from ___ .
    OUTPUT:
    
1 . Low lung volumes . No acute cardiopulmonary process . 2 . Right upper quadrant calcified gallstone .