Abstract
The objective of this study is to evaluate the usefulness and reliability of endoscopic endonasal skull base reconstructions using a nasal septal flap. This study is designed as a retrospective review. Between April 2005 and November 2009, we performed 32 endoscopic endonasal skull base reconstructions for closure of large dural defects. Eleven patients underwent reconstructions using fat grafts or the fascia lata (non-flap group). Twenty one patients underwent reconstructions using a nasal septal flap with a balloon catheter (flap group). Incidence of postoperative cerebrospinal fluid (CSF) leaks and perioperative insertion rate of external lumbar drain (ELD) were compared between the two groups. Postoperative CSF leaks occurred in two patients (9.5%) in the flap group. Three patients (27.3%) presented CSF leaks in the non-flap group. The rate of insertion of ELD was 81.8% in the non-flap group. In the flap group, one patient (4.8%) should be placed with ELD postoperatively. The incidence of postoperative CSF leaks in the flap group was lower than in the non-flap group, whereas the rate of insertion of ELD in the non-flap group was higher than in the flap group. Endoscopic endonasal skull base reconstruction using a nasal septal flap without ELD seems to be useful and reliable for ventral skull base defects after endoscopic endonasal approaches as compared with our previous single-layer reconstructions using free fat grafts or fascia lata. The long-term effectiveness of nasal septal flaps to prevent intracranial complications should be confirmed.
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This work was performed in collaboration with the Departments of Otorhinolaryngology and Bioenvironmental Medicine at Chiba University Graduate School of Medicine.
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Luigi Maria Cavallo, Paolo Cappabianca, Naples, Italy
This is an interesting article coming from a country that has a long tradition in the field of transsphenoidal surgery and, furthermore, from a group leaded by dr. Saeki who has already established in Japan as a relevant surgeon in performing pure endoscopic pituitary surgery.
This work follows a series of articles that recently have proved the efficacy of the nasoseptal flap in the reconstruction of skull base defects after extended endoscopic endonasal transsphenoidal surgery, thus helping in resolving a problem which was considered the Achille’s heel of such procedures.
Moreover it is clear as craniopharyngiomas and above all those expanding into the third ventricle are still exposed to an increased risk of post-operative CSF-leak for such reason requiring a special attention during the reconstruction phase of the surgical procedure.
In our experience, in those cases we have obtained a successfully reconstruction using a thin film of fibrin glue inside the intradural space and at the level of the skull base defect; this manoeuvre allowed the sealing of the sub-arachnoidal space which represents the source from which the CSF comes out. In this way a first, valid, watertight barrier against the CSF is realized.
This little trick, together with the routinary use of the nasoseptal flap, in our experience has really minimized, even in case of large oste-dural defects, the rate of post-operative CSF leak.
Miguel A. Arraez, Malaga, Spain
This article from Horiguchi and colleagues has several points of interest, regarding the best way to seal a dural defect after midbase neoplasms resection. Although the endoscopic approach is being used more and more for the approach of complex skull base lesions, some problems are still unsolved. One of the big troubles is reconstruction after dural opening and, as a matter of fact, the risk of persistent postoperative CSF fistula is considered for many authors the main drawback when comparing endoscopy with microsurgery to resect intradural lesions. Several techniques (with different tissues and materials) have been used to avoid such a complication, but those techniques eluding the principle of autologous pedicled and vascularized tissue may be condemned to fail if the dural defect is not small. Several publications have pointed out the usefulness of the nasal septum pedicled flap for the closure of midbase defects after endoscopic approaches. The paper from Horiguchi and colleagues states in that way. According to their experience, this kind of reconstruction is more effective than the multilayer (“non flap”) technique. Although the authors are wondering about the long-term results of the pedicled flap and the inherent surgical difficulties, the low incidence of postoperative ELD and CSF fistula merits the pedicled flap as the most reliable way to undertake the sealing of a complex dural defect after endoscopy. Another complementary aspect to congratulate the authors is the original design of the “sinus compression ballon”, that is supposed to distribute more properly the pressure inside the sphenoidal sinus in accordance to the needs of the flap.
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Horiguchi, K., Murai, H., Hasegawa, Y. et al. Endoscopic endonasal skull base reconstruction using a nasal septal flap: surgical results and comparison with previous reconstructions. Neurosurg Rev 33, 235–241 (2010). https://doi.org/10.1007/s10143-010-0247-8
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DOI: https://doi.org/10.1007/s10143-010-0247-8