Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present which accentuates the size of the cardiac silhouette which appears borderline enlarged . Mediastinal and hilar contours are normal . No pulmonary edema is demonstrated . Patchy opacity in the left lung base likely reflects a small pleural effusion and possibly atelectasis in the adjacent lung , though infection is difficult to exclude . No pneumothorax is seen . Cervical spinal fusion hardware is noted .
    OUTPUT:
    
Left basilar patchy opacity likely reflects a combination of a small left pleural effusion with adjacent atelectasis , but infection is not excluded in the correct clinical setting .