This is to report a case of Fibrous Dysplasia that has been treated in this clinic. 1) It took place in the left maxillar bone of a female of 17 years old. From the time cheek swelling appeared, about 3 years elaPsed before the patient decided to consult with this clinic. 2) In this case, neither abnomality of neighbor tissue nor swelling and pain of local lymhglands were found except the left cheek rwelling and a little tenderness. 3) Histologically, a eonfirmable diagnosis of Fibrous Dysplasia was given to the case. 4) Total removal was carried out in aceordance with the nature and condition of development of the case. 5) Operative prognosis was fairly good.