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Keratosis Obturans
H. Ric Harnsberger, MD
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KEY FACTS

  • Terminology

    • Imaging

      • Top Differential Diagnoses

        • Pathology

          • Clinical Issues

            • Diagnostic Checklist

              TERMINOLOGY

              • Abbreviations

                • External auditory canal (EAC)
                • Keratosis obturans (KO)
              • Synonyms

                • Laminated epithelial "plug;" keratin "plug"
              • Definitions

                • KO: Abnormal accumulation & obstruction of bony EAC from desquamated keratin without erosive bony changes

              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

                                      • Image Interpretation Pearls

                                        Selected References

                                        1. Park SY et al: Clinical characteristics of keratosis obturans and external auditory canal cholesteatoma. Otolaryngol Head Neck Surg. 152(2):326-30, 2015
                                        2. Shinnabe A et al: A comparison of patterns of disease extension in keratosis obturans and external auditory canal cholesteatoma. Otol Neurotol. 34(1):91-4, 2013
                                        3. Spielmann PM et al: Surgical management of external auditory canal lesions. J Laryngol Otol. 127(3):246-51, 2013
                                        4. Saunders NC et al: Complications of keratosis obturans. J Laryngol Otol. 120(9):740-4, 2006
                                        5. Loock J: Keratosis obturans and external ear cholesteatoma. Clin Otolaryngol. 30(2):213; author reply 213-4, 2005
                                        6. Kuczkowski J et al: Immunohistochemical and histopathological features of keratosis obturans and cholesteatoma of the external auditory canal. Atypical keratosis obturans. J Laryngol Otol. 118(3):249-50; author reply 250-1, 2004
                                        7. Persaud RA et al: Keratosis obturans and external ear canal cholesteatoma: how and why we should distinguish between these conditions. Clin Otolaryngol Allied Sci. 29(6):577-81, 2004
                                        8. Persaud R et al: Atypical keratosis obturans. J Laryngol Otol. 117(9):725-7, 2003
                                        9. Shire JR et al: Cholesteatoma of the external auditory canal and keratosis obturans. Am J Otol. 7(5):361-4, 1986
                                        10. Naiberg J et al: The pathologic features of keratosis obturans and cholesteatoma of the external auditory canal. Arch Otolaryngol. 110(10):690-3, 1984
                                        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

                                                    • Abbreviations

                                                      • External auditory canal (EAC)
                                                      • Keratosis obturans (KO)
                                                    • Synonyms

                                                      • Laminated epithelial "plug;" keratin "plug"
                                                    • Definitions

                                                      • KO: Abnormal accumulation & obstruction of bony EAC from desquamated keratin without erosive bony changes

                                                    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

                                                                            • Image Interpretation Pearls

                                                                              Selected References

                                                                              1. Park SY et al: Clinical characteristics of keratosis obturans and external auditory canal cholesteatoma. Otolaryngol Head Neck Surg. 152(2):326-30, 2015
                                                                              2. Shinnabe A et al: A comparison of patterns of disease extension in keratosis obturans and external auditory canal cholesteatoma. Otol Neurotol. 34(1):91-4, 2013
                                                                              3. Spielmann PM et al: Surgical management of external auditory canal lesions. J Laryngol Otol. 127(3):246-51, 2013
                                                                              4. Saunders NC et al: Complications of keratosis obturans. J Laryngol Otol. 120(9):740-4, 2006
                                                                              5. Loock J: Keratosis obturans and external ear cholesteatoma. Clin Otolaryngol. 30(2):213; author reply 213-4, 2005
                                                                              6. Kuczkowski J et al: Immunohistochemical and histopathological features of keratosis obturans and cholesteatoma of the external auditory canal. Atypical keratosis obturans. J Laryngol Otol. 118(3):249-50; author reply 250-1, 2004
                                                                              7. Persaud RA et al: Keratosis obturans and external ear canal cholesteatoma: how and why we should distinguish between these conditions. Clin Otolaryngol Allied Sci. 29(6):577-81, 2004
                                                                              8. Persaud R et al: Atypical keratosis obturans. J Laryngol Otol. 117(9):725-7, 2003
                                                                              9. Shire JR et al: Cholesteatoma of the external auditory canal and keratosis obturans. Am J Otol. 7(5):361-4, 1986
                                                                              10. Naiberg J et al: The pathologic features of keratosis obturans and cholesteatoma of the external auditory canal. Arch Otolaryngol. 110(10):690-3, 1984