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Petrous Apex Trapped Fluid
Jaclyn Thiessen, MD; Luke N. Ledbetter, MD
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KEY FACTS

  • Terminology

    • Imaging

      • Top Differential Diagnoses

        • Pathology

          • Clinical Issues

            TERMINOLOGY

            • Abbreviations

              • Trapped fluid within petrous apex (TF-PA)
            • Synonyms

              • Petrous apex (PA) effusion
            • Definitions

              • Sterile trapped fluid in PA air cells

            IMAGING

            • General Features

              • CT Findings

                • MR Findings

                  • Imaging Recommendations

                    DIFFERENTIAL DIAGNOSIS

                      PATHOLOGY

                      • General Features

                        • Microscopic Features

                          CLINICAL ISSUES

                          • Presentation

                            • Demographics

                              • Natural History & Prognosis

                                • Treatment

                                  DIAGNOSTIC CHECKLIST

                                  • Consider

                                    • Image Interpretation Pearls

                                      Selected References

                                      1. Campion T et al: Imaging of temporal bone inflammations in children: a pictorial review. Neuroradiology. 61(9):959-70, 2019
                                      2. Huyett P et al: Radiographic mastoid and middle ear effusions in intensive care unit subjects. Respir Care. 62(3):350-6, 2017
                                      3. Razek AA et al: Lesions of the petrous apex: classification and findings at CT and MR imaging. Radiographics. 32(1):151-73, 2012
                                      4. Chapman PR et al: Petrous apex lesions: pictorial review. AJR Am J Roentgenol. 196(3 Suppl):WS26-37 Quiz S40-3, 2011
                                      5. Lemmerling MM et al: Imaging of inflammatory and infectious diseases in the temporal bone. Neuroimaging Clin N Am. 19(3):321-37, 2009
                                      6. Arriaga MA: Petrous apex effusion: a clinical disorder. Laryngoscope. 116(8):1349-56, 2006
                                      7. Leonetti JP et al: Incidental petrous apex findings on magnetic resonance imaging. Ear Nose Throat J. 80(4):200-2, 205-6, 2001
                                      8. Palacios E et al: 'Don't touch me' lesions of the petrous apex. Ear Nose Throat J. 80(3):140, 2001
                                      9. Moore KR et al: 'Leave me alone' lesions of the petrous apex. AJNR Am J Neuroradiol. 19(4):733-8, 1998
                                      10. Gadre AK et al: Venous channels of the petrous apex: their presence and clinical importance. Otolaryngol Head Neck Surg. 116(2):168-74, 1997
                                      11. Jackler RK et al: Radiographic differential diagnosis of petrous apex lesions. Am J Otol. 13(6):561-74, 1992
                                      12. Arriaga MA et al: Differential diagnosis of primary petrous apex lesions. Am J Otol. 12(6):470-4, 1991
                                      13. Virapongse C et al: Computed tomography of temporal bone pneumatization: 1. Normal pattern and morphology. AJR Am J Roentgenol. 145(3):473-81, 1985
                                      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

                                                  • Trapped fluid within petrous apex (TF-PA)
                                                • Synonyms

                                                  • Petrous apex (PA) effusion
                                                • Definitions

                                                  • Sterile trapped fluid in PA air cells

                                                IMAGING

                                                • General Features

                                                  • CT Findings

                                                    • MR Findings

                                                      • Imaging Recommendations

                                                        DIFFERENTIAL DIAGNOSIS

                                                          PATHOLOGY

                                                          • General Features

                                                            • Microscopic Features

                                                              CLINICAL ISSUES

                                                              • Presentation

                                                                • Demographics

                                                                  • Natural History & Prognosis

                                                                    • Treatment

                                                                      DIAGNOSTIC CHECKLIST

                                                                      • Consider

                                                                        • Image Interpretation Pearls

                                                                          Selected References

                                                                          1. Campion T et al: Imaging of temporal bone inflammations in children: a pictorial review. Neuroradiology. 61(9):959-70, 2019
                                                                          2. Huyett P et al: Radiographic mastoid and middle ear effusions in intensive care unit subjects. Respir Care. 62(3):350-6, 2017
                                                                          3. Razek AA et al: Lesions of the petrous apex: classification and findings at CT and MR imaging. Radiographics. 32(1):151-73, 2012
                                                                          4. Chapman PR et al: Petrous apex lesions: pictorial review. AJR Am J Roentgenol. 196(3 Suppl):WS26-37 Quiz S40-3, 2011
                                                                          5. Lemmerling MM et al: Imaging of inflammatory and infectious diseases in the temporal bone. Neuroimaging Clin N Am. 19(3):321-37, 2009
                                                                          6. Arriaga MA: Petrous apex effusion: a clinical disorder. Laryngoscope. 116(8):1349-56, 2006
                                                                          7. Leonetti JP et al: Incidental petrous apex findings on magnetic resonance imaging. Ear Nose Throat J. 80(4):200-2, 205-6, 2001
                                                                          8. Palacios E et al: 'Don't touch me' lesions of the petrous apex. Ear Nose Throat J. 80(3):140, 2001
                                                                          9. Moore KR et al: 'Leave me alone' lesions of the petrous apex. AJNR Am J Neuroradiol. 19(4):733-8, 1998
                                                                          10. Gadre AK et al: Venous channels of the petrous apex: their presence and clinical importance. Otolaryngol Head Neck Surg. 116(2):168-74, 1997
                                                                          11. Jackler RK et al: Radiographic differential diagnosis of petrous apex lesions. Am J Otol. 13(6):561-74, 1992
                                                                          12. Arriaga MA et al: Differential diagnosis of primary petrous apex lesions. Am J Otol. 12(6):470-4, 1991
                                                                          13. Virapongse C et al: Computed tomography of temporal bone pneumatization: 1. Normal pattern and morphology. AJR Am J Roentgenol. 145(3):473-81, 1985