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CNV3 Motor Denervation
Bronwyn E. Hamilton, MD
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KEY FACTS

  • Terminology

    • Imaging

      • Pathology

        • Diagnostic Checklist

          TERMINOLOGY

          • Abbreviations

            • Trigeminal nerve (CNV)
              • Mandibular nerve: 3rd division (CNV3) of CNV (only division with motor function)
          • Synonyms

            • Denervation atrophy
          • Definitions

            • CNV3 motor denervation: Alteration in appearance of muscle groups from loss of innervation by CNV3
            • Denervation pattern identified
              • Acute (< 1 month): Muscles slightly enlarged with edema; enhancement seen
              • Subacute (≤ 12-20 months): Fatty replacement and atrophy begins
              • Chronic (> 12-20 months): Fatty atrophic muscles with significant volume loss

          IMAGING

          • General Features

            • CT Findings

              • MR Findings

                • Imaging Recommendations

                  DIFFERENTIAL DIAGNOSIS

                    PATHOLOGY

                    • General Features

                      • Gross Pathologic & Surgical Features

                        • Microscopic Features

                          CLINICAL ISSUES

                          • Presentation

                            • Demographics

                              • Natural History & Prognosis

                                • Treatment

                                  DIAGNOSTIC CHECKLIST

                                  • Consider

                                    • Image Interpretation Pearls

                                      Selected References

                                      1. Kim DH et al: Pure motor trigeminal neuropathy in a woman with tegmental pontine infarction. J Clin Neurosci. 20(12):1792-4, 2013
                                      2. Raz E et al: Parotid gland atrophy in patients with chronic trigeminal nerve denervation. AJNR Am J Neuroradiol. 34(4):860-3, 2013
                                      3. Chong V: Imaging the cranial nerves in cancer. Cancer Imaging. 4 Spec No A:S1-5, 2004
                                      4. Ho TL et al: Subacute mandibular and hypoglossal nerve denervation causing oedema of the masticator space and tongue. Neuroradiology. 45(4):262-6, 2003
                                      5. Ariji Y et al: Denervation atrophy of the masticatory muscles in a patient with nasopharyngeal cancer: MR examinations before and after radiotherapy. Dentomaxillofac Radiol. 31(3): 204-8, 2002
                                      6. Kato K et al: Motor denervation of tumors of the head and neck: changes in MR appearance. Magn Reson Med Sci. 1(3):157-64, 2002
                                      7. Fischbein NJ et al: MR imaging in two cases of subacute denervation change in the muscles of facial expression. AJNR Am J Neuroradiol. 22(5):880-4, 2001
                                      8. Caldemeyer KS et al: Imaging features and clinical significance of perineural spread or extension of head and neck tumors. Radiographics. 18(1):97-110; quiz 147, 1998
                                      9. Antoniades K et al: Hemifacial atrophy secondary to poliomyelitis. Int J Oral Maxillofac Surg. 26(3):215-6, 1997
                                      10. Russo CP et al: MR appearance of trigeminal and hypoglossal motor denervation. AJNR Am J Neuroradiol. 18(7):1375-83, 1997
                                      11. Davis SB et al: Masticator muscle enhancement in subacute denervation atrophy. AJNR Am J Neuroradiol. 16(6):1292-4, 1995
                                      12. Petersilge CA et al: Denervation hypertrophy of muscle: MR features. J Comput Assist Tomogr. 19(4): 596-600, 1995
                                      13. West GA et al: Magnetic resonance imaging signal changes in denervated muscles after peripheral nerve injury. Neurosurgery. 35(6): 1077-85; discussion 1085-6, 1994
                                      14. Fleckenstein JL et al: Denervated human skeletal muscle: MR imaging evaluation. Radiology. 187(1):213-8, 1993
                                      15. Uetani M et al: Denervated skeletal muscle: MR imaging. Work in progress. Radiology. 189(2): 511-5, 1993
                                      16. Schellhas KP: MR imaging of muscles of mastication. AJR Am J Roentgenol. 153(4):847-55, 1989
                                      17. Polak JF et al: Magnetic resonance imaging of skeletal muscle. Prolongation of T1 and T2 subsequent to denervation. Invest Radiol. 23(5): 365-9, 1988
                                      18. Shabas D et al: Magnetic resonance imaging examination of denervated muscle. Comput Radiol. 11(1): 9-13, 1987
                                      19. Harnsberger HR et al: Major motor atrophic patterns in the face and neck: CT evaluation. Radiology. 155(3):665-70, 1985
                                      Related Anatomy
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                                      Related Differential Diagnoses
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                                      References
                                      Tables

                                      Tables

                                      KEY FACTS

                                      • Terminology

                                        • Imaging

                                          • Pathology

                                            • Diagnostic Checklist

                                              TERMINOLOGY

                                              • Abbreviations

                                                • Trigeminal nerve (CNV)
                                                  • Mandibular nerve: 3rd division (CNV3) of CNV (only division with motor function)
                                              • Synonyms

                                                • Denervation atrophy
                                              • Definitions

                                                • CNV3 motor denervation: Alteration in appearance of muscle groups from loss of innervation by CNV3
                                                • Denervation pattern identified
                                                  • Acute (< 1 month): Muscles slightly enlarged with edema; enhancement seen
                                                  • Subacute (≤ 12-20 months): Fatty replacement and atrophy begins
                                                  • Chronic (> 12-20 months): Fatty atrophic muscles with significant volume loss

                                              IMAGING

                                              • General Features

                                                • CT Findings

                                                  • MR Findings

                                                    • Imaging Recommendations

                                                      DIFFERENTIAL DIAGNOSIS

                                                        PATHOLOGY

                                                        • General Features

                                                          • Gross Pathologic & Surgical Features

                                                            • Microscopic Features

                                                              CLINICAL ISSUES

                                                              • Presentation

                                                                • Demographics

                                                                  • Natural History & Prognosis

                                                                    • Treatment

                                                                      DIAGNOSTIC CHECKLIST

                                                                      • Consider

                                                                        • Image Interpretation Pearls

                                                                          Selected References

                                                                          1. Kim DH et al: Pure motor trigeminal neuropathy in a woman with tegmental pontine infarction. J Clin Neurosci. 20(12):1792-4, 2013
                                                                          2. Raz E et al: Parotid gland atrophy in patients with chronic trigeminal nerve denervation. AJNR Am J Neuroradiol. 34(4):860-3, 2013
                                                                          3. Chong V: Imaging the cranial nerves in cancer. Cancer Imaging. 4 Spec No A:S1-5, 2004
                                                                          4. Ho TL et al: Subacute mandibular and hypoglossal nerve denervation causing oedema of the masticator space and tongue. Neuroradiology. 45(4):262-6, 2003
                                                                          5. Ariji Y et al: Denervation atrophy of the masticatory muscles in a patient with nasopharyngeal cancer: MR examinations before and after radiotherapy. Dentomaxillofac Radiol. 31(3): 204-8, 2002
                                                                          6. Kato K et al: Motor denervation of tumors of the head and neck: changes in MR appearance. Magn Reson Med Sci. 1(3):157-64, 2002
                                                                          7. Fischbein NJ et al: MR imaging in two cases of subacute denervation change in the muscles of facial expression. AJNR Am J Neuroradiol. 22(5):880-4, 2001
                                                                          8. Caldemeyer KS et al: Imaging features and clinical significance of perineural spread or extension of head and neck tumors. Radiographics. 18(1):97-110; quiz 147, 1998
                                                                          9. Antoniades K et al: Hemifacial atrophy secondary to poliomyelitis. Int J Oral Maxillofac Surg. 26(3):215-6, 1997
                                                                          10. Russo CP et al: MR appearance of trigeminal and hypoglossal motor denervation. AJNR Am J Neuroradiol. 18(7):1375-83, 1997
                                                                          11. Davis SB et al: Masticator muscle enhancement in subacute denervation atrophy. AJNR Am J Neuroradiol. 16(6):1292-4, 1995
                                                                          12. Petersilge CA et al: Denervation hypertrophy of muscle: MR features. J Comput Assist Tomogr. 19(4): 596-600, 1995
                                                                          13. West GA et al: Magnetic resonance imaging signal changes in denervated muscles after peripheral nerve injury. Neurosurgery. 35(6): 1077-85; discussion 1085-6, 1994
                                                                          14. Fleckenstein JL et al: Denervated human skeletal muscle: MR imaging evaluation. Radiology. 187(1):213-8, 1993
                                                                          15. Uetani M et al: Denervated skeletal muscle: MR imaging. Work in progress. Radiology. 189(2): 511-5, 1993
                                                                          16. Schellhas KP: MR imaging of muscles of mastication. AJR Am J Roentgenol. 153(4):847-55, 1989
                                                                          17. Polak JF et al: Magnetic resonance imaging of skeletal muscle. Prolongation of T1 and T2 subsequent to denervation. Invest Radiol. 23(5): 365-9, 1988
                                                                          18. Shabas D et al: Magnetic resonance imaging examination of denervated muscle. Comput Radiol. 11(1): 9-13, 1987
                                                                          19. Harnsberger HR et al: Major motor atrophic patterns in the face and neck: CT evaluation. Radiology. 155(3):665-70, 1985