Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained . There is a stable opacity at the left lung base which is compatible with pleural effusion in this patient with history of prior left lower lobe resection . Overall appearance is stable without signs of pneumonia or CHF . No pneumothorax is seen . Suture material is also noted in the left upper lung . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Status post left lower lobe resection with left pleural effusion , similar to prior exam .