Journal of neurosurgery
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OBJECTIVE The object of this study was to examine the relationships of the cochlea as a guide for avoiding both cochlear damage with loss of hearing in middle fossa approaches and injury to adjacent structures in approaches directed through the cochlea. METHODS Twenty adult cadaveric middle fossae were examined using magnifications of ×3 to ×40. RESULTS The cochlea sits below the floor of the middle fossa in the area between and below the labyrinthine segment of the facial nerve and greater petrosal nerve (GPN) and adjacent to the lateral genu of the petrous carotid. ⋯ The medial part of the basal and middle turns are the parts at greatest risk in drilling the floor of the middle fossa to expose the nerves in middle fossa approaches to the internal acoustic meatus and in anterior petrosectomy approaches. Resection of the cochlea is used selectively in extending approaches through the mastoid toward the lateral edge of the clivus and front of the brainstem. CONCLUSIONS An understanding of the location and relationships of the cochlea will reduce the likelihood of cochlear damage with hearing loss in approaches directed through the middle fossa and reduce the incidence of injury to adjacent structures in approaches directed through the cochlea.
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Journal of neurosurgery · Nov 2016
Review Case ReportsEndovascular management of internal carotid artery injuries secondary to endonasal surgery: case series and review of the literature.
OBJECTIVE Internal carotid artery (ICA) injury is a rare but severe complication of endonasal surgery. The authors describe their endovascular experience managing ICA injuries after transsphenoidal surgery; they review and summarize the current literature regarding endovascular techniques; and they propose a treatment algorithm based on the available evidence. METHODS A retrospective review of 576 transsphenoidal pituitary adenoma resections was performed. ⋯ Vessel sacrifice remains the definitive treatment for acute, uncontrolled bleeding; however, vessel preservation techniques should be considered carefully in select patients. Multiple factors including vascular anatomy, injury characteristics, and risk of dual antiplatelet therapy should guide best treatment, but more study is needed (particularly with flow diverters) to refine this decision-making process. Ideally, all endovascular treatment options should be available at institutions performing endonasal surgery.
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Journal of neurosurgery · Nov 2016
Less-aggressive surgical management and long-term outcomes of jugular foramen paragangliomas: a neurosurgical perspective.
OBJECTIVE The aim of this study was to analyze the neurological functional outcome and recurrent risks in surgically treated jugular foramen paragangliomas (JFPs) and to propose an individualized therapeutic strategy. METHODS Clinical charts and radiological information were reviewed retrospectively in 51 consecutive cases of JFPs. Less-aggressive surgical interventions were adopted with the goal of preserving neurovascular structures. ⋯ Most patients could adapt to surgical morbidities and carry out normal life activities. Preserving neurological function was a priority, and maximal decompression with or without radiotherapy was desirable to preserve a patient's quality of life when radical resection was not warranted. Early surgery plus preoperative devascularization was proposed, and radiotherapy was mandatory for lesions with pathological mitosis.