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Perimesencephalic Nonaneurysmal SAH
Anne G. Osborn, MD, FACR
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KEY FACTS

  • Terminology

    • Imaging

      • Top Differential Diagnoses

        • Pathology

          • Clinical Issues

            TERMINOLOGY

            • Abbreviations

              • Perimesencephalic nonaneurysmal subarachnoid hemorrhage (pnSAH)
            • Synonyms

              • Benign perimesencephalic SAH
            • Definitions

              • SAH centered immediately anterior to midbrain ± pons
              • No source demonstrated at angiography

            IMAGING

            • General Features

              • CT Findings

                • MR Findings

                  • Angiographic Findings

                    • Imaging Recommendations

                      DIFFERENTIAL DIAGNOSIS

                        PATHOLOGY

                        • General Features

                          • Gross Pathologic & Surgical Features

                            CLINICAL ISSUES

                            • Presentation

                              • Demographics

                                • Natural History & Prognosis

                                  • Treatment

                                    DIAGNOSTIC CHECKLIST

                                    • Consider

                                      • Image Interpretation Pearls

                                        Selected References

                                        1. Marder CP et al: Subarachnoid hemorrhage: beyond aneurysms. AJR Am J Roentgenol. 202(1):25-37, 2014
                                        2. Buyukkaya R et al: The relationship between perimesencephalic subarachnoid hemorrhage and deep venous system drainage pattern and calibrations. Clin Imaging. 38(3):226-30, 2014
                                        3. Kapadia A et al: Nonaneurysmal perimesencephalic subarachnoid hemorrhage: diagnosis, pathophysiology, clinical characteristics and long-term outcome. World Neurosurg. ePub, 2014
                                        4. Kim YW et al: Nonaneurysmal subarachnoid hemorrhage: an update. Curr Atheroscler Rep. 14(4):328-34, 2012
                                        5. Kong Y et al: Perimesencephalic subarachnoid hemorrhage: risk factors, clinical presentations, and outcome. Acta Neurochir Suppl. 110(Pt 1):197-201, 2011
                                        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

                                                    • Perimesencephalic nonaneurysmal subarachnoid hemorrhage (pnSAH)
                                                  • Synonyms

                                                    • Benign perimesencephalic SAH
                                                  • Definitions

                                                    • SAH centered immediately anterior to midbrain ± pons
                                                    • No source demonstrated at angiography

                                                  IMAGING

                                                  • General Features

                                                    • CT Findings

                                                      • MR Findings

                                                        • Angiographic Findings

                                                          • Imaging Recommendations

                                                            DIFFERENTIAL DIAGNOSIS

                                                              PATHOLOGY

                                                              • General Features

                                                                • Gross Pathologic & Surgical Features

                                                                  CLINICAL ISSUES

                                                                  • Presentation

                                                                    • Demographics

                                                                      • Natural History & Prognosis

                                                                        • Treatment

                                                                          DIAGNOSTIC CHECKLIST

                                                                          • Consider

                                                                            • Image Interpretation Pearls

                                                                              Selected References

                                                                              1. Marder CP et al: Subarachnoid hemorrhage: beyond aneurysms. AJR Am J Roentgenol. 202(1):25-37, 2014
                                                                              2. Buyukkaya R et al: The relationship between perimesencephalic subarachnoid hemorrhage and deep venous system drainage pattern and calibrations. Clin Imaging. 38(3):226-30, 2014
                                                                              3. Kapadia A et al: Nonaneurysmal perimesencephalic subarachnoid hemorrhage: diagnosis, pathophysiology, clinical characteristics and long-term outcome. World Neurosurg. ePub, 2014
                                                                              4. Kim YW et al: Nonaneurysmal subarachnoid hemorrhage: an update. Curr Atheroscler Rep. 14(4):328-34, 2012
                                                                              5. Kong Y et al: Perimesencephalic subarachnoid hemorrhage: risk factors, clinical presentations, and outcome. Acta Neurochir Suppl. 110(Pt 1):197-201, 2011