02Oct 2022
Formal Closure of Endoscopic Endonasal Skull Base Defects With a “Bow Tie” Tri‐Layer Graft

Formal Closure of Endoscopic Endonasal Skull Base Defects With a “Bow Tie” Tri‐Layer Graft

This article analyzes the outcomes of our endoscopic experience closing surgical skull base defects in the central skull base, comparing a single-layer inlay graft to a three-layer (Bow tie) graft consisting of fat with two layers of the collagen matrix. Reviewing our experience in two epochs, we found that the successful seal of the defect was achieved with the Bow tie graft. Risk factors for a postoperative cerebrospinal fluid leak (CSF) after surgery include a high intraoperative flow of CSF, elevated body mass index, defect size, and defect site. In epoch I, from 2005 to 2013, 79 patients had reconstruction with a single layer of dural graft. In epoch II, from 2014 to 2017, 70 patients had reconstruction with the Bow tie. CSF leak rates were 8.7% overall: 15.2% in epoch I and 1.4% in epoch II (p = 0.01). After controlling the procedure, defects with a size greater than 2 cm had a 5.7 greater likelihood of failure. Epoch II had a lower incidence o

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