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Middle Ear Prolapsing Facial Nerve
H. Ric Harnsberger, MD
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KEY FACTS

  • Terminology

    • Imaging

      • Top Differential Diagnoses

        • Clinical Issues

          • Diagnostic Checklist

            TERMINOLOGY

            • Definitions

              • Midtympanic facial nerve (CNVII) segment protrudes through bony dehiscence
              • CNVII dehiscence refers only to segmental absence of bony covering of CNVII
              • Prolapsing CNVII: CNVII protrudes through dehiscence

            IMAGING

            • General Features

              • CT Findings

                • MR Findings

                  • Imaging Recommendations

                    DIFFERENTIAL DIAGNOSIS

                      PATHOLOGY

                      • General Features

                        • Gross Pathologic & Surgical Features

                          CLINICAL ISSUES

                          • Presentation

                            • Demographics

                              • Natural History & Prognosis

                                • Treatment

                                  DIAGNOSTIC CHECKLIST

                                  • Image Interpretation Pearls

                                    • Reporting Tips

                                      Selected References

                                      1. Yetiser S: The dehiscent facial nerve canal. Int J Otolaryngol. 679708, 2012
                                      2. Yu Z et al: The value of preoperative CT scan of tympanic facial nerve canal in tympanomastoid surgery. Acta Otolaryngol. 131(7):774-8, 2011
                                      3. Ozbek C et al: Incidence of fallopian canal dehiscence at surgery for chronic otitis media. Eur Arch Otorhinolaryngol. 266(3):357-62, 2009
                                      4. Di Martino E et al: Fallopian canal dehiscences: a survey of clinical and anatomical findings. Eur Arch Otorhinolaryngol. 262(2):120-6, 2005
                                      5. Daniels RL et al: The other ear: findings and results in 1,800 bilateral stapedectomies. Otol Neurotol. 22(5):603-7, 2001
                                      6. Park GC et al: Dehiscence of the tympanic segment of the facial nerve. Otolaryngol Head Neck Surg. 123(4):522, 2000
                                      7. Tange RA et al: Dehiscences of the horizontal segment of the facial canal in otosclerosis. ORL J Otorhinolaryngol Relat Spec. 59(5):277-9, 1997
                                      8. Swartz JD: The facial nerve canal: CT analysis of the protruding tympanic segment. Radiology. 153(2):443-7, 1984
                                      Related Anatomy
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                                      Related Differential Diagnoses
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                                      References
                                      Tables

                                      Tables

                                      KEY FACTS

                                      • Terminology

                                        • Imaging

                                          • Top Differential Diagnoses

                                            • Clinical Issues

                                              • Diagnostic Checklist

                                                TERMINOLOGY

                                                • Definitions

                                                  • Midtympanic facial nerve (CNVII) segment protrudes through bony dehiscence
                                                  • CNVII dehiscence refers only to segmental absence of bony covering of CNVII
                                                  • Prolapsing CNVII: CNVII protrudes through dehiscence

                                                IMAGING

                                                • General Features

                                                  • CT Findings

                                                    • MR Findings

                                                      • Imaging Recommendations

                                                        DIFFERENTIAL DIAGNOSIS

                                                          PATHOLOGY

                                                          • General Features

                                                            • Gross Pathologic & Surgical Features

                                                              CLINICAL ISSUES

                                                              • Presentation

                                                                • Demographics

                                                                  • Natural History & Prognosis

                                                                    • Treatment

                                                                      DIAGNOSTIC CHECKLIST

                                                                      • Image Interpretation Pearls

                                                                        • Reporting Tips

                                                                          Selected References

                                                                          1. Yetiser S: The dehiscent facial nerve canal. Int J Otolaryngol. 679708, 2012
                                                                          2. Yu Z et al: The value of preoperative CT scan of tympanic facial nerve canal in tympanomastoid surgery. Acta Otolaryngol. 131(7):774-8, 2011
                                                                          3. Ozbek C et al: Incidence of fallopian canal dehiscence at surgery for chronic otitis media. Eur Arch Otorhinolaryngol. 266(3):357-62, 2009
                                                                          4. Di Martino E et al: Fallopian canal dehiscences: a survey of clinical and anatomical findings. Eur Arch Otorhinolaryngol. 262(2):120-6, 2005
                                                                          5. Daniels RL et al: The other ear: findings and results in 1,800 bilateral stapedectomies. Otol Neurotol. 22(5):603-7, 2001
                                                                          6. Park GC et al: Dehiscence of the tympanic segment of the facial nerve. Otolaryngol Head Neck Surg. 123(4):522, 2000
                                                                          7. Tange RA et al: Dehiscences of the horizontal segment of the facial canal in otosclerosis. ORL J Otorhinolaryngol Relat Spec. 59(5):277-9, 1997
                                                                          8. Swartz JD: The facial nerve canal: CT analysis of the protruding tympanic segment. Radiology. 153(2):443-7, 1984