Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is persistent opacification of the medial right lower lung . There is a small right pleural effusion . No pneumothorax is detected . There is no evidence for pulmonary edema . The aorta is tortuous . The patient is status post left upper lobectomy ; surgical changes with volume loss are evident .
    OUTPUT:
    
Right lower lobe pneumonia , which has not cleared , and small right pleural effusion .