Florid Cemento-Osseous Dysplasia of Osteolytic Stage Showing Cyst-Like Findings on CT and MRI: A Case Report

Abstract

We report our experience of florid cemento-osseous dysplasia(FCOD)showing cyst-like findings on Computed tomography(CT)and Magnetic resonance imaging(MRI), along with some literature review. A 36-year-old Japanese woman was referred to department of Oral and Maxillofacial surgery, Nihon University School of Dentistry at Matsudo for a radiolucent lesion in lower right molar area. Pantomogram showed multiple cystic lesions of the mandible. CT demonstrated the well-defined multilocular homogeneous waterdensity lesions in right molar, incisor and left molar areas. No obvious the buccolingual bone expansion and displacement of the inferior alveolar canal due to the lesions were observed. T1-weighted MRI showed low signal intensity lesions. T2-weighted MRI showed heterogeneous high signal intensity lesions. Postcontrast T1-weighted MRI showed low signal intensity lesions with peripheral contrast-enhancement like cystic lesion. These findings led to a suspicion of cystic lesions, and we performed cystectomy. Histopathologically, cellular fibrous stroma with trabecular bone and cementum-like materials were shown. There was no arrangement of osteoblasts around the bony tissue. Dilated blood vessels were also observed in the stroma. The diagnosis of FCOD was established based on the histopathological examination combined with the imaging findings. The postoperative course over two years were uneventful.