Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Midline sternotomy wires and mediastinal clips are again noted as well as a prosthetic cardiac valve . As seen previously , there is an area of scarring and loculated effusion obscuring the right lung base which is stable from multiple prior exams . The left lung is clear . Heart is top normal in size . No pneumothorax . Bony structures are intact .
    OUTPUT:
    
Stable opacity and effusion at the right lung base which has been previously seen and agree with recommendation on prior CT for pleural fluid analysis if not already performed .