Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are fully expanded and clear . No pleural effusion , pulmonary edema , or pneumothorax is seen . The heart , mediastinal and pleural surface contours are normal . A density seen projecting over the region of the bifurcation of the left main stem bronchus could represent a vessel or a possible foreign body , not clearly visualized on the lateral view .
    OUTPUT:
    
Question of possible radiodense foreign body projecting over the region of the bifurcation of the left main stem bronchus could represent a vessel or a possible foreign body . This may be further evaluated with shallow oblique radiographs .