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Fibrous dysplasia is a developmental anomaly of bone formation, which is characterized by a replacement of the normal bone and marrow by fibrous tissue as well as small, woven spicules of bone. These lesions may exist in a monostotic or polyostotic form and are generally found in the 4 th decade of age or younger with a slightly higher incidence in girls than boys. We report a case of monostotic fibrous dysplasia that was associated with a pathologic fracture and a kyphotic deformity in the cervical spine. (Fig. 1A, B, C, D). 컴퓨터 단층 사진상 제4, 5 경추의 해면골이 양측 측방괴로 확장되는 저음영 의 조직으로 대치된 소견과 피질골이 얇아지고 파괴된 소 견을 볼 수 있었으며( Fig. 2A, B, C) 자기 공명 영상 촬영 사진상 제4와 제5 경추체, 경추경, 추궁판에서 음영이 감 소된 병소가 관찰되었으며 척추강 내로의 병변의 침