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C1 Dysmorphism/Hypoplastic Arch
Kevin R. Moore, MD
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KEY FACTS

  • Terminology

    • Imaging

      • Top Differential Diagnoses

        • Pathology

          • Clinical Issues

            • Diagnostic Checklist

              TERMINOLOGY

              • Synonyms

                • Hypoplastic C1, hypoplastic atlas
              • Definitions

                • Thickened C1 ring reduced in AP (anteroposterior) diameter

              IMAGING

              • General Features

                • Radiographic Findings

                  • CT Findings

                    • MR Findings

                      • Imaging Recommendations

                        DIFFERENTIAL DIAGNOSIS

                          PATHOLOGY

                          • General Features

                            • Gross Pathologic & Surgical Features

                              CLINICAL ISSUES

                              • Presentation

                                • Natural History & Prognosis

                                  • Treatment

                                    DIAGNOSTIC CHECKLIST

                                    • Consider

                                      Selected References

                                      1. Pang D et al: Embryology and bony malformations of the craniovertebral junction. Childs Nerv Syst. 27(4):523-64, 2011
                                      2. Giussani C et al: Severely symptomatic craniovertebral junction abnormalities in children: long-term reliability of aggressive management. Pediatr Neurosurg. 45(1):29-36, 2009
                                      3. Smoker WR et al: Imaging the craniocervical junction. Childs Nerv Syst. 24(10):1123-45, 2008
                                      Related Anatomy
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                                      Related Differential Diagnoses
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                                      References
                                      Tables

                                      Tables

                                      KEY FACTS

                                      • Terminology

                                        • Imaging

                                          • Top Differential Diagnoses

                                            • Pathology

                                              • Clinical Issues

                                                • Diagnostic Checklist

                                                  TERMINOLOGY

                                                  • Synonyms

                                                    • Hypoplastic C1, hypoplastic atlas
                                                  • Definitions

                                                    • Thickened C1 ring reduced in AP (anteroposterior) diameter

                                                  IMAGING

                                                  • General Features

                                                    • Radiographic Findings

                                                      • CT Findings

                                                        • MR Findings

                                                          • Imaging Recommendations

                                                            DIFFERENTIAL DIAGNOSIS

                                                              PATHOLOGY

                                                              • General Features

                                                                • Gross Pathologic & Surgical Features

                                                                  CLINICAL ISSUES

                                                                  • Presentation

                                                                    • Natural History & Prognosis

                                                                      • Treatment

                                                                        DIAGNOSTIC CHECKLIST

                                                                        • Consider

                                                                          Selected References

                                                                          1. Pang D et al: Embryology and bony malformations of the craniovertebral junction. Childs Nerv Syst. 27(4):523-64, 2011
                                                                          2. Giussani C et al: Severely symptomatic craniovertebral junction abnormalities in children: long-term reliability of aggressive management. Pediatr Neurosurg. 45(1):29-36, 2009
                                                                          3. Smoker WR et al: Imaging the craniocervical junction. Childs Nerv Syst. 24(10):1123-45, 2008