title: C1-2 block vertebra. Fusion of the anterior arch of the atlas with the axis. Follow-up of the fusion in a child.
abstract: A peculiar form of C1-2 block vertebra (anterior arch of the atlas with the axis) is described. The progressive ossification is followed up in a child from the age of 9 to 15. The author also reviews the data of his five previously reported cases.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001368:Axis, Cervical Vertebra / Q000000981:diagnostic imaging*; D001270:Cervical Atlas / Q000000981:diagnostic imaging*; D002648:Child; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography; D013580:Synostosis / Q000000981:diagnostic imaging*