Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . There is no focal consolidation , effusion , or pneumothorax . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact . A rounded calcified structure projects below the left hemidiaphragm measuring 3 .6 by 3 .2 cm .
    OUTPUT:
    
1 . No acute intrathoracic process . 2 . Round calcified structure in the left subdiaphragmatic space , of unclear etiology .