Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate intact sternal wires and clips along the left mediastinum . The heart is top - normal in size . Opacity projecting over the lower lungs on lateral view may correspond to either retrocardiac opacity or right infrahilar opacity . There are bilateral small pleural effusions and possible mild heart failure . No pleural effusion or pneumothorax is appreciated . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
1 . Opacity projecting over the lower lung on lateral view may correspond either retrocardiac or right infrahilar opacity . 2 . Bilateral small pleural effusions and possible mild heart failure .