ORKAN, ISM / SCIENCE PHOTO LIBRARY ORKAN, ISM / SCIENCE PHOTO LIBRARY
Osteofibrous dysplasia. Computed tomography (CT) scan of the upper jaw of a patient, showing a large ossifying fibroma, or osteofibrous dysplasia, (round, upper left) with complete invasion of the right maxillary sinus. This benign (non-cancerous) tumour is composed of connective tissue and may occur after a bone fracture or other injury.
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