Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Large left - sided pleural effusion with mild associated mediastinal shift to the right is new . Left prepectoral dual lead pacemaker in - situ with the lead tips in the right atrium and right ventricle . Surgical clips in the mid abdomen in keeping with previous pancreatic surgery . Right prepectoral Port - A - Cath in situ with the tip in the proximal right atrium . No right lung lesions .
    OUTPUT:
    
Large left - sided pleural effusion with mild mass effect .