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Background Endoscopic endonasal transclival approaches provide direct access to the ventral skull base allowing the treating of clival and paraclival pathology without the manipulation of the brain or neurovascular structures. Postoperative spinal fluid leak, however, remains a challenge and various techniques have been described to reconstruct the operative defect. The "gasket seal" has been well-described, but has anatomic challenges when applied to clival defects. We describe a modification of this technique for use in endonasal tran