Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left PICC tip sits at the confluence of brachiocephalic veins . The heart size is within normal limits . An angular curved density projecting over the heart is felt to be external to the patient . The mediastinal and hilar contours are normal . The lung volumes are mildly low but clear of consolidation . There is no large pleural effusion or pneumothorax ; the right hemidiaphragm appears chronically elevated . An old right rib fracture is nondisplaced . A right upper quadrant abdominal drain is present .
    OUTPUT:
    
No evidence of pneumonia .