Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal consolidation , pleural effusion , or pneumothorax . The pulmonary vasculature is not engorged . Mild streaky opacification at the left lung base is compatible with mild atelectasis . The cardiac silhouette is top normal in size . The mediastinal and hilar contours are within normal limits . A 1 .4 x 1 .1 cm radiopaque density projecting over the right upper quadrant of the abdomen may represent a large gallstone . No acute osseous abnormality is detected .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . 1 .4 x 1 .1 cm density in the right upper quadrant may reflect a large gallstone .