Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . Patchy left basilar opacification has decreased . There is no pneumothorax . There is a patchy non-specific right infrahilar density , as mentioned previously , not significantly changed . Patchy right infrahilar density appears unchanged . Based on effacement of the posterior left costophrenic sulcus , there is potentially a very small pleural effusion . The lungs appear hyperinflated . Bony structures are unremarkable .
    OUTPUT:
    
Improving left basilar opacity . Possible trace left - sided pleural effusion . Persistent appearance of patchy nodular right infrahilar opacity ; in follow - up , evaluation with bilateral oblique views versus chest CT is recommended , as discussed previously .