Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is borderline enlarged . The mediastinal and hilar contours are normal . There is no pulmonary edema . Minimal patchy left basilar opacity likely reflects atelectasis . No focal consolidation , pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities . Partially imaged is a right shoulder arthroplasty .
    OUTPUT:
    
Patchy left basilar opacity , likely atelectasis . Pneumonia is not completely excluded in the correct clinical setting .