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Parotid Schwannoma
Carmen C. Cho, MBBS, FRCR; H. Y. Yuen, MBChB, FRCR; Anil T. Ahuja, MD, FRCR
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KEY FACTS

  • Imaging

    • Top Differential Diagnoses

      • Diagnostic Checklist

        TERMINOLOGY

        • Synonyms

          • Nerve sheath tumor
          • Neurilemmoma
          • Neurogenic tumor (includes nerve sheath tumor and neurofibroma)
        • Definitions

          • Benign tumor arising from intraparotid facial nerve Schwann cells
        • Associated Syndromes

          • Neurofibromatosis type 2
            • Commonly bilateral and with nerve sheath tumors at other sites of body

        IMAGING

        • General Features

          • Ultrasonographic Findings

            • CT Findings

              • MR Findings

                • Imaging Recommendations

                  DIFFERENTIAL DIAGNOSIS

                    PATHOLOGY

                    • Staging, Grading, & Classification

                      • Gross Pathologic & Surgical Features

                        • Microscopic Features

                          CLINICAL ISSUES

                          • Presentation

                            • Demographics

                              • Natural History & Prognosis

                                • Treatment

                                  DIAGNOSTIC CHECKLIST

                                  • Image Interpretation Pearls

                                    Selected References

                                    1. Lee DW et al: Diagnosis and surgical outcomes of intraparotid facial nerve schwannoma showing normal facial nerve function. Int J Oral Maxillofac Surg. 42(7):874-9, 2013
                                    2. Gross BC et al: The intraparotid facial nerve schwannoma: a diagnostic and management conundrum. Am J Otolaryngol. 33(5):497-504, 2012
                                    3. Ma Q et al: Diagnosis and management of intraparotid facial nerve schwannoma. J Craniomaxillofac Surg. 38(4):271-3, 2010
                                    4. Tanna N et al: Intraparotid facial nerve schwannoma: clinician beware. Ear Nose Throat J. 88(8):E18-20, 2009
                                    5. Salemis NS et al: Large intraparotid facial nerve schwannoma: case report and review of the literature. Int J Oral Maxillofac Surg. 37(7):679-81, 2008
                                    6. Lee JD et al: Management of facial nerve schwannoma in patients with favorable facial function. Laryngoscope. 117(6):1063-8, 2007
                                    7. Wippold FJ 2nd et al: Neuropathology for the neuroradiologist: Antoni A and Antoni B tissue patterns. AJNR Am J Neuroradiol. 28(9):1633-8, 2007
                                    8. Shimizu K et al: Intraparotid facial nerve schwannoma: a report of five cases and an analysis of MR imaging results. AJNR Am J Neuroradiol. 26(6):1328-30, 2005
                                    9. Assad L et al: Fine-needle aspiration of parotid gland schwannomas mimicking pleomorphic adenoma: a report of two cases. Diagn Cytopathol. 30(1):39-40, 2004
                                    10. Beaman FD et al: Schwannoma: radiologic-pathologic correlation. Radiographics. 24(5):1477-81, 2004
                                    11. Caughey RJ et al: Intraparotid facial nerve schwannoma: diagnosis and management. Otolaryngol Head Neck Surg. 130(5):586-92, 2004
                                    12. Jee WH et al: Extraaxial neurofibromas versus neurilemmomas: discrimination with MRI. AJR Am J Roentgenol. 183(3):629-33, 2004
                                    13. Gritzmann N et al: Sonography of the salivary glands. Eur Radiol. 13(5):964-75, 2003
                                    14. Jaehne M et al: Clinical aspects and therapy of extratemporal facial neurinoma. HNO. 49(4):264-9, 2001
                                    15. Chong KW et al: Management of intraparotid facial nerve schwannomas. Aust N Z J Surg. 70(10):732-4, 2000
                                    Related Anatomy
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                                    Related Differential Diagnoses
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                                    References
                                    Tables

                                    Tables

                                    KEY FACTS

                                    • Imaging

                                      • Top Differential Diagnoses

                                        • Diagnostic Checklist

                                          TERMINOLOGY

                                          • Synonyms

                                            • Nerve sheath tumor
                                            • Neurilemmoma
                                            • Neurogenic tumor (includes nerve sheath tumor and neurofibroma)
                                          • Definitions

                                            • Benign tumor arising from intraparotid facial nerve Schwann cells
                                          • Associated Syndromes

                                            • Neurofibromatosis type 2
                                              • Commonly bilateral and with nerve sheath tumors at other sites of body

                                          IMAGING

                                          • General Features

                                            • Ultrasonographic Findings

                                              • CT Findings

                                                • MR Findings

                                                  • Imaging Recommendations

                                                    DIFFERENTIAL DIAGNOSIS

                                                      PATHOLOGY

                                                      • Staging, Grading, & Classification

                                                        • Gross Pathologic & Surgical Features

                                                          • Microscopic Features

                                                            CLINICAL ISSUES

                                                            • Presentation

                                                              • Demographics

                                                                • Natural History & Prognosis

                                                                  • Treatment

                                                                    DIAGNOSTIC CHECKLIST

                                                                    • Image Interpretation Pearls

                                                                      Selected References

                                                                      1. Lee DW et al: Diagnosis and surgical outcomes of intraparotid facial nerve schwannoma showing normal facial nerve function. Int J Oral Maxillofac Surg. 42(7):874-9, 2013
                                                                      2. Gross BC et al: The intraparotid facial nerve schwannoma: a diagnostic and management conundrum. Am J Otolaryngol. 33(5):497-504, 2012
                                                                      3. Ma Q et al: Diagnosis and management of intraparotid facial nerve schwannoma. J Craniomaxillofac Surg. 38(4):271-3, 2010
                                                                      4. Tanna N et al: Intraparotid facial nerve schwannoma: clinician beware. Ear Nose Throat J. 88(8):E18-20, 2009
                                                                      5. Salemis NS et al: Large intraparotid facial nerve schwannoma: case report and review of the literature. Int J Oral Maxillofac Surg. 37(7):679-81, 2008
                                                                      6. Lee JD et al: Management of facial nerve schwannoma in patients with favorable facial function. Laryngoscope. 117(6):1063-8, 2007
                                                                      7. Wippold FJ 2nd et al: Neuropathology for the neuroradiologist: Antoni A and Antoni B tissue patterns. AJNR Am J Neuroradiol. 28(9):1633-8, 2007
                                                                      8. Shimizu K et al: Intraparotid facial nerve schwannoma: a report of five cases and an analysis of MR imaging results. AJNR Am J Neuroradiol. 26(6):1328-30, 2005
                                                                      9. Assad L et al: Fine-needle aspiration of parotid gland schwannomas mimicking pleomorphic adenoma: a report of two cases. Diagn Cytopathol. 30(1):39-40, 2004
                                                                      10. Beaman FD et al: Schwannoma: radiologic-pathologic correlation. Radiographics. 24(5):1477-81, 2004
                                                                      11. Caughey RJ et al: Intraparotid facial nerve schwannoma: diagnosis and management. Otolaryngol Head Neck Surg. 130(5):586-92, 2004
                                                                      12. Jee WH et al: Extraaxial neurofibromas versus neurilemmomas: discrimination with MRI. AJR Am J Roentgenol. 183(3):629-33, 2004
                                                                      13. Gritzmann N et al: Sonography of the salivary glands. Eur Radiol. 13(5):964-75, 2003
                                                                      14. Jaehne M et al: Clinical aspects and therapy of extratemporal facial neurinoma. HNO. 49(4):264-9, 2001
                                                                      15. Chong KW et al: Management of intraparotid facial nerve schwannomas. Aust N Z J Surg. 70(10):732-4, 2000