Thirty-three children were examined operated on for histologically verified fibrous osteodysplasia. X-ray examinations of the maxilla and mandible were carried out in the nasofrontal and lateral projections, roentgenograms were made in the semiaxial and naso-forehead projections, and intraoral roentgenograms of the teeth and alveolar processes, orthopantomograms of the mandible, and linear tomograms were made. Five variants of an x-ray picture of fibrous dysplasia were distinguished which should be taken into consideration in differential diagnosis.
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