title: Congenital anomaly of the atlas misdiagnosed as posterior arch fracture of the atlas and atlantoaxial subluxation.
abstract: Partial or complete absence of the posterior arch of the atlas is a well-documented anomaly but a relatively rare condition. This condition is usually asymptomatic so most are diagnosed incidentally. There have been a few documented cases of congenital defects of the posterior arch of the atlas combined with atlantoaxial subluxation. We report a very rare case of congenital anomaly of the atlas combined with atlantoaxial subluxation, that can be misdiagnosed as posterior arch fracture.
authors.affiliation: Department of Orthopedic Surgery, National Health Insurance Cooperation Ilsan Hospital, Goyang, Korea.
authors.forename: Yung
authors.initials: Y
authors.lastname: Park
authors.affiliation: Department of Orthopedic Surgery, National Health Insurance Cooperation Ilsan Hospital, Goyang, Korea.
authors.forename: Seong Min
authors.initials: SM
authors.lastname: Kim
authors.affiliation: Department of Orthopedic Surgery, National Health Insurance Cooperation Ilsan Hospital, Goyang, Korea.
authors.forename: Yun Tae
authors.initials: YT
authors.lastname: Lee
authors.affiliation: Department of Orthopedic Surgery, National Health Insurance Cooperation Ilsan Hospital, Goyang, Korea.
authors.forename: Ju Hyung
authors.initials: JH
authors.lastname: Yoo
authors.affiliation: Department of Orthopedic Surgery, National Health Insurance Cooperation Ilsan Hospital, Goyang, Korea.
authors.forename: Hyun Chul
authors.initials: HC
authors.lastname: Oh
authors.affiliation: Department of Orthopedic Surgery, National Health Insurance Cooperation Ilsan Hospital, Goyang, Korea.
authors.forename: Joong-Won
authors.initials: JW
authors.lastname: Ha
authors.affiliation: Department of Orthopedic Surgery, National Health Insurance Cooperation Ilsan Hospital, Goyang, Korea.
authors.forename: Seung Yong
authors.initials: SY
authors.lastname: Sung
authors.affiliation: Department of Orthopedic Surgery, National Health Insurance Cooperation Ilsan Hospital, Goyang, Korea.
authors.forename: Han Kook
authors.initials: HK
authors.lastname: Yoon
authors.affiliation: Department of Orthopedic Surgery, National Health Insurance Cooperation Ilsan Hospital, Goyang, Korea.
authors.forename: Jee-Hoon
authors.initials: JH
authors.lastname: Chang
authors.affiliation: Department of Orthopedic Surgery, National Health Insurance Cooperation Ilsan Hospital, Goyang, Korea.
authors.forename: Jeung-Yeul
authors.initials: JY
authors.lastname: Jung
mesh_terms: D000328:Adult; D001270:Cervical Atlas / Q000002:abnormalities*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D013122:Spinal Diseases / Q000175:diagnosis*
keywords: Atlantoaxial subluxation; Congenital anomaly of the atlas; Posterior arch fracture