Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright view of the chest provided . Ill - defined opacity in the right lung base could represent pneumonia . There is a small effusion the left base . No pneumothorax . Cardiomegaly is mild . Imaged osseous structures are intact . Irregular appearance of the left humerus may be due to old fracture . Old right eighth rib fracture is seen . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
1 . Ill - defined opacity in the right lung base could represent pneumonia . 2 . Irregular appearance of the left humerus may be due to old fracture .