title: C1-C2 block vertebra with fusion of anterior arch of atlas and the odontoid.
abstract: A rare case of atlanto-axial block vertebra and fusion of anterior arch with the dens, with instability at the atlanto-occipital joint, is reported. The literature is briefly reviewed.
authors.affiliation: Department of Radiodiagnosis, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, India.
authors.forename: S
authors.initials: S
authors.lastname: Gupta
authors.forename: R V
authors.initials: RV
authors.lastname: Phadke
authors.forename: V K
authors.initials: VK
authors.lastname: Jain
mesh_terms: D000328:Adult; D001269:Atlanto-Occipital Joint / Q000000981:diagnostic imaging*; D001270:Cervical Atlas / Q000002:abnormalities*; D006801:Humans; D004204:Joint Dislocations / Q000000981:diagnostic imaging / Q000209:etiology*; D008297:Male; D009809:Odontoid Process / Q000002:abnormalities*; D011859:Radiography