title: Primary spondylolysis of the axis vertebra (C2) in three children, including one with pyknodysostosis.
abstract: This report describes 3 children with a cleft in the pedicles of the second cervical vertebra of uncertain cause. One of these patients had pyknodysostosis. Previous instances of such defects in the literature are reviewed with some considerations on the possible nature of the lesion.
authors.affiliation: Department of Radiology, Children's Medical Center, Dallas, Texas.
authors.forename: G
authors.initials: G
authors.lastname: Currarino
mesh_terms: D002574:Cervical Vertebrae / Q000000981:diagnostic imaging*; D002675:Child, Preschool; D003394:Craniofacial Dysostosis / Q000150:complications / Q000000981:diagnostic imaging*; D006801:Humans; D007223:Infant; D008297:Male; D011859:Radiography; D013168:Spondylolisthesis / Q000000981:diagnostic imaging*; D013169:Spondylolysis / Q000150:complications / Q000000981:diagnostic imaging*