[Diagnostic difficulties in one patient with chronic periostitis of the lower jaw]

The problem of chronic periostitis of the jaws and the difficulties that sometimes arise in differentiation from a tumourous process is briefly discussed. A case of a ten year old child with chronic ossifying periostitis is described that caused considerable differentiation-diagnostic difficulties, mainly because of the X-ray findings of orthopantomography and computer tomography, presenting data suggesting more a tumourous disease of the lower jaw. After the extraction of the sixth tooth of the lower jaw, with a chronic periapical process, and after antibiotic treatment, the disease was healed.