Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Again demonstrated within the left lower lobe is a triangular area of opacification which appears improved compared to the prior exam , likely the residua of prior necrotizing pneumonia . Minimal blunting of the left costophrenic sulcus may suggest chronic pleural thickening or fluid . No new areas of focal consolidation otherwise demonstrated . There is no pneumothorax . No acute osseous abnormality seen .
    OUTPUT:
    
Triangular area of opacification in the left lower lobe likely reflects sequela of prior necrotizing pneumonia , and is improved compared to the prior radiograph . Blunting of the right costophrenic angle may be due to chronic pleural thickening or trace fluid . No new areas of focal consolidation are demonstrated to suggest pneumonia .