title: Cystic cemento-ossifying fibroma of the ethmoidal cells (a case report).
abstract: A case report of an aggressive cystic cemento-ossifying fibroma of the ethmoidal cells is presented. Fibro-osseous lesions containing cementum are considered to be of periodontal membrane origin and are most common in the mandible and maxilla. Following the WHO classification, fibro-osseous lesions containing cementum are grouped together under the heading of cementoma and are divided into four subgroups. Cemento-ossifying fibroma is considered to be a variant of cementifying fibroma which is a sub-group of cementoma. The unique site of origin seen in this case is thought to have been the result of an ectopic periodontal membrane or of a primitive mesenchymal cell rest or incomplete migration of the medial part of the nasal anlage and differentiation into the periodontal membrane.
authors: Department of Otolaryngology, Jichi Medical School, Tochigi, Japan.
authors: Y
authors: Y
authors: Fujimoto
authors: M
authors: M
authors: Katoh
authors: M
authors: M
authors: Miyata
authors: T
authors: T
authors: Kawai
authors: K
authors: K
authors: Saito
authors: M
authors: M
authors: Morita
mesh_terms: D000293:Adolescent; D002485:Cementoma / Q000000981:diagnostic imaging / Q000473:pathology; D003560:Cysts / Q000000981:diagnostic imaging / Q000473:pathology; D005004:Ethmoid Bone / Q000000981:diagnostic imaging / Q000473:pathology; D006801:Humans; D008297:Male; D009808:Odontogenic Tumors / Q000000981:diagnostic imaging / Q000473:pathology; D011859:Radiography; D012888:Skull Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology