Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs of the chest demonstrate a sharply demarcated homogeneously opaque structure causing mass effect on the lateral aspect of the right hemidiaphragm . When compared to the CT , this corresponds to the fluid collection between the dome of the liver and the right hemidiaphragm . The lungs are otherwise clear . The hilar and cardiomediastinal contours are normal . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal .
    OUTPUT:
    
1 . Fluid collection , better evaluated on the CT , superiorly displacing the lateral aspect of the right hemidiaphragm . 2 . No evidence of pneumonia or other acute cardiopulmonary process .