Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate pleural effusion on the right side is new with compressive atelectasis of unknown etiology . Left lung is unremarkable . Right apical opacity is unchanged since ___ and is probably compatible with scarring . There is no pneumothorax . Mediastinal and cardiac contours are unremarkable .
    OUTPUT:
    
Patient is known with prior breast cancer . Moderate right pleural effusion is new and is of unknown etiology . Dr . ___ has been verbally contacted for the results .