Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded . Ill - defined opacity at the left base on the frontal projection is not confirmed on the lateral and may reflect a pericardial fat pad . The heart is not enlarged . The mediastinal hilar contours are normal . Mild blunting of the posterior costophrenic sulcus may reflect a small pleural effusion of unclear laterality . There is no pneumothorax . A curvilinear opacity just under the medial right hemidiaphragm is likely contained within bowel .
    OUTPUT:
    
1 . Faint opacity at the left base likely reflects pericardial fat pad , less likely pneumonia . 2 . Curvilinear opacity at the medial right hemidiaphragm is likely contained within bowel . Intraperitoneal free air is difficult to exclude completely , however a left lateral decubitus radiograph of the abdomen should be able to answer the question .