Neurosurgery notes/Procedures/Cranial procedures/Approaches/Skull base approaches/Posterior fossa approaches/CPA approach/Presigmoid approaches/Retrolabyrinthine (posterior petrosectomy) approach/Combined anterior-posterior petrosectomy

Combined anterior-posterior petrosectomy

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Retrolabyrinthine (posterior petrosectomy) approach
  • Both posterior and anterior petrosectomies provide a more lateral exposure of the supratrigeminal zone (STZ), peritrigeminal zone (PTZ), and lateral pontine zone (LPZ), with theoretically better angles of approach to lateral pontine pathology extending dorsally within the pons
      • A presigmoid retrolabyrinthine approach exposing Trautmann’s triangle.
       
      A close-up of a human body AI-generated content may be incorrect.
      • Opening the dura along the anterior edge of the sigmoid sinus and lower edge of the superior petrosal sinus exposes the cerebellopontine angle and the petrosal fissure
      Close-up of a human body AI-generated content may be incorrect.
      • The three safe entry zones—the STZ, PTZ, and LPZ—are exposed within a quite limited area of exposure.
      Close-up of a human body AI-generated content may be incorrect.
      • The Kawase approach is performed to provide a very anterolateral view of the trigeminal nerve (cranial nerve [CN] V) root entry zone and both the STZ and PTZ
       
      A close-up of a human body AI-generated content may be incorrect.