title: Malignant hemangiopericytoma of the condyle.
abstract: Hemangiopericytoma (HPC) is an uncommon vascular tumor arising from pericytic cells with variable malignant potential. Primary HPCs of the bone are extremely rare; however, involvement of the condylar process has not been reported. We presented a 21-year-old female patient with low-grade malignant HPC in the right mandibular condyle. Clinical examination and imaging findings revealed a well-defined soft mass, encapsulating the mandibular condyle from behind. The lesion and mandibular condyle were removed simultaneously; then, the costochondral graft was used to reconstruct the defect. Histopathologic examinations of the specimen confirmed the diagnosis. After 2 years of follow-up, the patient is free of disease, and mouth opening returned to normal.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Ninth People's Hospital, College of Stomatology, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Zhou
authors.forename: Chi
authors.initials: C
authors.lastname: Yang
authors.forename: Ya-ting
authors.initials: YT
authors.lastname: Qiu
authors.forename: Li-zhen
authors.initials: LZ
authors.lastname: Wang
authors.forename: Jia-wei
authors.initials: JW
authors.lastname: Zheng
authors.forename: Zhi-yuan
authors.initials: ZY
authors.lastname: Zhang
mesh_terms: D000071443:12E7 Antigen; D015703:Antigens, CD / Q000032:analysis; D015815:Cell Adhesion Molecules / Q000032:analysis; D003937:Diagnosis, Differential; D005260:Female; D005500:Follow-Up Studies; D006393:Hemangiopericytoma / Q000175:diagnosis*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008335:Mandibular Condyle / Q000473:pathology*; D008339:Mandibular Neoplasms / Q000175:diagnosis*; D010027:Osteotomy / Q000379:methods; D016059:Range of Motion, Articular / Q000502:physiology; D014057:Tomography, X-Ray Computed; D014746:Vimentin / Q000032:analysis; D055815:Young Adult
chemical_list: D000071443:12E7 Antigen; D015703:Antigens, CD; C061828:CD99 protein, human; D015815:Cell Adhesion Molecules; D014746:Vimentin