Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Widening of the right mediastinal stripe reflects known lymphadenopathy . The heart is mildly enlarged . There is new elevation of the right hemidiaphragm , not specific although a possible cause is a subpulmonic effusion although not explicitly demonstrated . There is , however , indication of a very small pleural effusion on the left with patchy retrocardiac opacity , which is mostly frequently due to atelectasis . Lung volumes are low .
    OUTPUT:
    
Patchy new retrocardiac opacity although more likely to represent atelectasis than pneumonia . Probable small effusion on the left . New elevation of the right hemidiaphragm , not specific ; among other possible causes a subpulmonic effusion could yield this appearance . Mediastinal lymphadenopathy . Standard PA and lateral radiographs may be useful to reassess if needed clinically .