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Temporal Bone Arachnoid Granulations
H. Ric Harnsberger, MD
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KEY FACTS

  • Terminology

    • Imaging

      • Top Differential Diagnoses

        • Pathology

          • Clinical Issues

            TERMINOLOGY

            • Abbreviations

              • Arachnoid granulation (AG)
            • Synonyms

              • Aberrant AG, osteodural defects
              • When large → giant AG
            • Definitions

              • Temporal bone AG: Nonvenous sinus-related (aberrant) pseudopodial pia-arachnoid projection into tegmen tympani or posterior wall of temporal bone

            IMAGING

            • General Features

              • CT Findings

                • MR Findings

                  • Imaging Recommendations

                    DIFFERENTIAL DIAGNOSIS

                      PATHOLOGY

                      • General Features

                        • Gross Pathologic & Surgical Features

                          • Microscopic Features

                            CLINICAL ISSUES

                            • Presentation

                              • Demographics

                                • Treatment

                                  Selected References

                                  1. Junet P et al: Spontaneous osteo-dural fistulae of petrous bone posterior wall. Eur Ann Otorhinolaryngol Head Neck Dis. 130(6):341-3, 2013
                                  2. Lee MH et al: Prevalence and appearance of the posterior wall defects of the temporal bone caused by presumed arachnoid granulations and their clinical significance: CT findings. AJNR Am J Neuroradiol. 29(9):1704-7, 2008
                                  3. VandeVyver V et al: Arachnoid granulations of the posterior temporal bone wall: imaging appearance and differential diagnosis. AJNR Am J Neuroradiol. 28(4):610-2, 2007
                                  4. Gacek RR et al: Adult spontaneous cerebrospinal fluid otorrhea: diagnosis and management. Am J Otol. 20(6):770-6, 1999
                                  5. Gacek RR et al: Arachnoid granulations of the temporal bone. Am J Otol. 20(3):405-6, 1999
                                  6. Gacek RR: Evaluation and management of temporal bone arachnoid granulations. Arch Otolaryngol Head Neck Surg. 118(3):327-32, 1992
                                  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

                                            TERMINOLOGY

                                            • Abbreviations

                                              • Arachnoid granulation (AG)
                                            • Synonyms

                                              • Aberrant AG, osteodural defects
                                              • When large → giant AG
                                            • Definitions

                                              • Temporal bone AG: Nonvenous sinus-related (aberrant) pseudopodial pia-arachnoid projection into tegmen tympani or posterior wall of temporal bone

                                            IMAGING

                                            • General Features

                                              • CT Findings

                                                • MR Findings

                                                  • Imaging Recommendations

                                                    DIFFERENTIAL DIAGNOSIS

                                                      PATHOLOGY

                                                      • General Features

                                                        • Gross Pathologic & Surgical Features

                                                          • Microscopic Features

                                                            CLINICAL ISSUES

                                                            • Presentation

                                                              • Demographics

                                                                • Treatment

                                                                  Selected References

                                                                  1. Junet P et al: Spontaneous osteo-dural fistulae of petrous bone posterior wall. Eur Ann Otorhinolaryngol Head Neck Dis. 130(6):341-3, 2013
                                                                  2. Lee MH et al: Prevalence and appearance of the posterior wall defects of the temporal bone caused by presumed arachnoid granulations and their clinical significance: CT findings. AJNR Am J Neuroradiol. 29(9):1704-7, 2008
                                                                  3. VandeVyver V et al: Arachnoid granulations of the posterior temporal bone wall: imaging appearance and differential diagnosis. AJNR Am J Neuroradiol. 28(4):610-2, 2007
                                                                  4. Gacek RR et al: Adult spontaneous cerebrospinal fluid otorrhea: diagnosis and management. Am J Otol. 20(6):770-6, 1999
                                                                  5. Gacek RR et al: Arachnoid granulations of the temporal bone. Am J Otol. 20(3):405-6, 1999
                                                                  6. Gacek RR: Evaluation and management of temporal bone arachnoid granulations. Arch Otolaryngol Head Neck Surg. 118(3):327-32, 1992