Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Opacification at the lung bases is largely moderate atelectasis on the right , combination of moderate left pleural effusion and moderate atelectasis on the left . Upper lungs clear . Heart size normal . No pneumothorax . No pneumoperitoneum . Left of diaphragmatic pleural drain in similar position , of of known peritoneal collection .
    OUTPUT:
    
Moderate left effusion with moderate bibasal opacities have not been placed changed , given the adjacent sub phrenic intra-abdominal collection , there is concern for infected left pleural effusion .