Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . There is a single air - fluid level at the apex with mostly fluid within the right pleura , likely loculated at the right lung base . No pneumothorax is evident . Right chest tube is in place . Left lung is unremarkable . Stable cardiomediastinal contours . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Stable right pleural effusion , likely loculated at the right lung base . No pneumothorax identified .