- How I do it article
- Open Access
The inferior turbinate flap in skull base reconstruction
© Yip et al; licensee BioMed Central Ltd. 2013
Received: 9 December 2012
Accepted: 25 December 2012
Published: 31 January 2013
As the indications for expanded endonasal approaches continue to evolve, alternative reconstructive techniques are needed to address increasingly complex surgical skull base defects. In the absence of the nasoseptal flap, we describe our experience with the posterior pedicle inferior turbinate flap (PPITF) in skull base reconstruction.
Academic tertiary care centre.
Patients who underwent reconstruction of the skull base with the PPITF were identified. Medical records were reviewed for demographic, presentation, treatment, follow-up, surgical and outcomes data.
Main outcome measures
Flap survival, adequacy of seal, and complications.
Two patients with residual/recurrent pituitary adenomas met the inclusion criteria. The nasoseptal flap was unavailable in each case due to a prior septectomy. Salvage of the original nasoseptal flap was not possible, as it did not provide adequate coverage of the resultant defect due to contraction from healing. All PPITFs healed uneventfully and covered the entire defect. No complications were observed in the early post-operative period. Endoscopic techniques and limitations of the PPITF are also discussed.
Our clinical experience supports the PPITF to be a viable alternative for reconstruction of the skull base in the absence of the nasoseptal flap.
Over the past decade, the role of endoscopic surgery in the management of anterior skull base pathologies has evolved. Expanded endonasal approaches (EEA) provide exposure to skull base and intradural pathology, while reducing the morbidity associated with traditional craniofacial approaches [1–4]. Following tumor extirpation, the resultant cranial base defect requires reconstruction to form a watertight barrier separating the intracranial compartment and sinonasal tract. Failure to achieve adequate separation can lead to complications, including cerebrospinal fluid (CSF) leak, pneumocephalus and meningitis [5, 6]. Small fistulae (<1 cm) can be repaired with a high rate of success using a variety of multilayered free grafts . In such cases, long-term prevention of CSF leaks and infections appear to be independent of the material or technique (inlay or overlay) used in the repair [7, 8].
Skull base defects resulting from EEAs are more challenging to reconstruct due to their complexity and size. With the increase in frequency of EEAs and variety of pathologies treated, a reconstructive ladder in defect repair is developing. Local vascularized flaps have become the main reconstructive option due to their ease of elevation, low donor site morbidity, low complication rate, and propensity for rapid and complete healing [9, 10]. The Hadad-Bassagasteguy flap (HBF), a vascularized pedicled nasoseptal mucoperiosteal flap based on the nasoseptal artery, has significantly decreased the incidence of postoperative CSF leaks . However, the surgeon must consider alternatives to the HBF flap, particularly in situations where it is not available due to tumor involvement of the septum, or in revision cases where a previous septectomy has been performed.
The posterior pedicle inferior turbinate flap (PPITF) has been described as an appropriate alternative . The PPITF is based on the inferior turbinate artery, a branch of the posterolateral nasal artery, which arises from the sphenopalatine artery. This intranasal flap is advantageous compared to regional vascular flaps, including the temporoparietal fascial and pericranial flaps, as it eliminates the morbidity associated with an external incision and minimizes healing time due to rapid mucosalization. Through a case series, we describe our experience with the PPITF.
We retrospectively analyzed the demographic, presentation, treatment, follow-up, surgical and outcomes data of two patients who underwent skull base reconstruction with the PPITF at Toronto Western Hospital and Mount Sinai Hospital (Toronto, Ontario, Canada). The Research Ethics Board at each institution approved the study.
A multilayered reconstruction is usually accomplished with a collagen matrix as an underlay (DuraGen®, Integra LifeSciences; Plansboro, NJ, USA) followed by the flap as an overlay. The edges of the flap are covered with Surgicel® (Ethicon; Somerville, NJ, USA) and the whole area is matted with fibrin glue. Saline-soaked Gelfoam® (Pfizer; NY, USA) follows, and a foley catheter is gently inflated and buttressed against the repair. Doyle silastic splints are sutured across the septum.
Two patients underwent skull base reconstruction using the PPITF.
A 44 year-old female initially presented with amenorrhea and galactorrhea in 1998, and subsequently underwent a sublabial, trans-sphenoidal approach for resection of a pituitary macroadenoma. The sellar floor was reconstructed with Surgicel®, Gelfoam® and a bone graft from the septum. Nine years postoperatively, the patient was taken back to the operating room because of recurrent amenorrhea and tumour growth on serial imaging. The surgery at this time included an EEA with posterior septectomy and wide sphenoidectomy. The cranial base defect was reconstructed this time with a middle turbinate mucosal flap.
A recent MRI scan showed residual tumor across the clivus with a nodular component in the prepontine cistern invaginating the anterior surface of the pons. The decision was made to undergo a third operation, and the residual tumor was resected using an EEA via trans-clival and trans-sellar approaches. Due to a previous septectomy, the HBF was unavailable and the defect was repaired with a right PPITF. At 18 days post-operatively, there was no evidence of a CSF leak or infection, and the sellar cavity was healing well.
A 60 year-old female was referred to our clinic in June 2010 for evaluation of a pituitary adenoma. She initially presented with apoplexy secondary to compression of the optic chiasm by a large pituitary macroadenoma. The patient underwent urgent surgical decompression by EEA via a trans-sphenoidal approach with a right middle turbinectomy, posterior ethmoidectomy and posterior septectomy. A HBF was used to repair her resultant skull base defect at that time. Post-operatively, the patient regained her field of vision in her left eye and her visual acuity remained unchanged. Serial imaging showed a stable residual tumor within the right pituitary fossa, extending into the suprasellar cistern, with minimal compression of the optic chiasm and right proximal optic nerve.
At 17 months post-operatively, she complained of progressive right-sided visual field loss and decline in visual acuity. The residual tumor was resected using an EEA via a trans-sphenoidal approach. The previous nasoseptal flap was removed and a right-sided PPITF was raised to reconstruct the skull base. Excellent coverage was achieved.
In similar revision cases, the senior author (AV) usually attempts to salvage the original nasoseptal flap, as previously described . However, in this case, contraction of the flap (secondary to healing) did not allow for adequate coverage of the resultant defect.
Follow-up and complications
The basic tenets of skull base reconstruction are to separate the cranial cavity from the sinonasal tract and to protect vital neurovascular structures . A hermetic separation protects against post-operative CSF leaks, ascending bacterial infections, as well as vascular blowouts and pseudoaneurysms secondary to desiccation or infection of major vessels . Although repair of small CSF fistulas are successful in >95% of cases, large dural defects after EEAs pose a complex reconstructive challenge for the endoscopic surgeon. Repair of such defects must take into account additional factors, including the anticipated size, shape and location of the dural defect, intra-arachnoid dissection, previous intranasal or maxillofacial surgeries, previous radiation treatment, and the risk of increased CSF pressure post-operatively [11, 14, 15]. An ideal reconstruction should be reliable and minimize the complications relating to inadequate closure. The reconstructive ladder for skull base repair is based on the concept of employing the simplest procedure with the highest success rate, regardless of technical complexity . This can be seen as a contrast to the traditional concept, which uses the least complicated and safest procedure available. The ladder currently includes avascular grafts, nasoseptal pedicled flaps, turbinate flaps, and regional flaps .
Vascularized flaps provide the most reliable and reproducible reconstruction of large skull base defects . These flaps are also associated with lower postoperative CSF leak rates compared to free tissue grafts . The HBF (i.e. posterior pedicle nasoseptal flap) has become the workhorse of endonasal reconstruction due to its versatility, good arc of rotation and large surface area . The reconstructive surgeon however must consider alternatives when the HBF is not available, for example if there is tumour involvement of the septum or if a previous posterior septectomy was performed (the latter is often the case in revision surgeries). In such scenarios, the PPITF is a suitable alternative . The anatomy and vascular supply of the lateral nasal wall has previously been described [17–20]. Blood supply to the PPITF arises from the inferior turbinate artery, a terminal branch of the posterolateral nasal artery, which in turn is a branch of sphenopalatine artery. Additional contributions are supplied from branches of the facial artery .
Historically, pedicled inferior turbinate flaps have been used for the closure of nasal septal perforations and oronasal fistulas [21–23]. Fortes et al. were the first to describe the use of the PPITF for skull base reconstruction. In their series, four patients underwent successful reconstruction with the PPITF after their index operation resulted in posterior cranial fossa defects and nasoseptal flaps were unavailable . Lee et al. recently published a case series of five patients who had skull base defects repaired with the PPITF. With increasing surgical experience and appropriate patient selection, they found the PPITF to be a reliable reconstructive option due to its excellent blood supply . The current series of two patients adds significantly to the aforementioned studies, and it is also the first to describe the use of this complex, technically-advanced procedure at a Canadian institution. We showed that the PPITF was associated with minimal morbidity and postoperative complications. Initial nasal crusting resolved with re-mucosalization of the donor site. Adequate seal and 100% flap survival were achieved in all cases.
There are limitations to the PPITF, including its limited ability to reach the anterior skull base. An anatomic analysis showed that the PPITF could only reach 67% of the length of anterior cranial fossa defects . To address this, an anteriorly based inferior turbinate flap has been shown to cover large portions of the anterior cranial fossa, from the posterior table of frontal sinus to the planum . This flap can be used alone or in combination with the HBF or PPITF with relatively minimal morbidity . Another limitation of the PPITF is that its surface area is not as extensive compared to nasoseptal or extranasal flaps [12, 25]. The estimated surface area of the PPITF is 2.4 ± 1.0 cm2 5.4 cm length by 2.2 cm width) . However, additional mucosa extending beyond the lateral nasal wall, including the mucoperiosteum of the inferior lateral wall, inferior meatus, and nasal floor, can be harvested to increase the surface area of the flap [6, 27]. It has been suggested that the surface area of these enlarged flaps may be three times greater than the PPITF . In addition, the vascularized mucoperiosteum placed on the centre of the defect and augmented by free grafts may be sufficient to provide a complete, hermetic seal . Finally, in certain situations, bilateral PPITFs can be harvested to ensure complete coverage of the defect.
As an alternative to the nasoseptal flap, the posterior pedicle inferior turbinate flap (PPITF) is a viable and safe alternative for skull base reconstruction, particularly for posterior cranial fossa defects. Our outcomes were comparable to other case series using the PPITF. Careful preoperative planning is necessary to ensure complete coverage of skull base defects.
This material has never been published and is not currently under evaluation in any other peer-reviewed publication.
We would like to sincerely thank Bonnie Tang for her graphic illustrations.
- Kassam A, Snyderman CH, Mintz A, Gardner P, Carrau RL: Expanded endonasal approach: the rostrocaudal axis, Part II. Posterior clinoids to the foramen magnum. Neurosurg Focus. 2005, 19: E4.PubMedGoogle Scholar
- Kassam A, Gardner P, Snyderman CH, Mintz A, Carrau R: Expanded endonasal approach: fully endoscopic, completely transnasal approach to the middle third of the clivus, petrous bone, middle cranial fossa, and infratemporal fossa. Neurosurg Focus. 2005, 19: E6.PubMedGoogle Scholar
- Kassam A, Snyderman CH, Mintz A, Gardner P, Carrau RL: Expanded endonasal approach: the rostrocaudal axis, Part I. Crista galli to the sella turcica. Neurosurg Focus. 2005, 19: E3.PubMedGoogle Scholar
- Cavallo LM, Messina A, Gardner P, Esposito F, Kassam AB, Cappabianca P, de Divitiis E, Tschabitscher M: Extended endoscopic endonasal approach to the pterygopalatine fossa: anatomical study and clinical considerations. Neurosurg Focus. 2005, 19: E5.PubMedGoogle Scholar
- Gagliardi F, Boari N, Mortini P: Reconstruction techniques in skull base surgery. J Craniofac Surg. 2011, 22: 1015-1020. 10.1097/SCS.0b013e31821015b5.PubMedView ArticleGoogle Scholar
- Rivera-Serrano CM, Bassagaisteguy LH, Hadad G, Carrau RL, Kelly D, Prevedello DM, Fernandez-Miranda J, Kassam AB: Posterior pedicle lateral nasal wall flap: new reconstructive technique for large defects of the skull base. Am J Rhinol Allergy. 2011, 25: e212-e216. 10.2500/ajra.2011.25.3693.PubMedView ArticleGoogle Scholar
- Hegazy HM, Carrau RL, Snyderman CH, Kassam A, Zweig J: Transnasal endoscopic repair of cerebrospinal fluid rhinorrhea: a meta-analysis. Laryngoscope. 2000, 110: 1166-1172. 10.1097/00005537-200007000-00019.PubMedView ArticleGoogle Scholar
- Briggs RJ, Wormald PJ: Endoscopic transnasal intradural repair of anterior skull base cerebrospinal fluid fistulae. J Clin Neurosci. 2004, 11: 597-599. 10.1016/j.jocn.2003.09.011.PubMedView ArticleGoogle Scholar
- Harvey RJ, Nogueira JF, Schlosser RJ, Patel SJ, Vellutini E, Stamm AC: Closure of large skull base defects after endoscopic trans-nasal craniotomy, Clinical article. J Neurosurg. 2009, 111: 371-379. 10.3171/2008.8.JNS08236.PubMedView ArticleGoogle Scholar
- Zanation AM, Carrau RL, Snyderman CH, Germanwala AV, Gardner PA, Prevedello DM, Kassam AB: Nasoseptal flap reconstruction of high flow intraoperative cerebral spinal fluid leaks during endoscopic skull base surgery. Am J Rhinol Allergy. 2009, 23: 518-521. 10.2500/ajra.2009.23.3378.PubMedView ArticleGoogle Scholar
- Hadad G, Bassagasteguy L, Carrau RL, Mataza JC, Kassam A, Snyderman CH, Mintz A: A novel reconstructive technique after endoscopic expanded endonasal approaches: vascular pedicle nasoseptal flap. Laryngoscope. 2006, 116: 1882-1886. 10.1097/01.mlg.0000234933.37779.e4.PubMedView ArticleGoogle Scholar
- Fortes FS, Carrau RL, Snyderman CH, Prevedello D, Vescan A, Mintz A, Gardner P, Kassam AB: The posterior pedicle inferior turbinate flap: a new vascularized flap for skull base reconstruction. Laryngoscope. 2007, 117: 1329-1332. 10.1097/mlg.0b013e318062111f.PubMedView ArticleGoogle Scholar
- Zanation AM, Carrau RL, Snyderman CH, McKinney KA, Wheless SA, Bhatki AM, Gardner PA, Prevedello DM, Kassam AB: Nasoseptal flap takedown and reuse in revision endoscopic skull base reconstruction. Laryngoscope. 2011, 121: 42-46. 10.1002/lary.21162.PubMedView ArticleGoogle Scholar
- Patel MR, Stadler ME, Snyderman CH, Carrau RL, Kassam AB, Germanwala AV, Gardner P, Zanation AM: How to choose? Endoscopic skull base reconstructive options and limitations. Skull Base. 2010, 20: 397-404. 10.1055/s-0030-1253573.PubMedPubMed CentralView ArticleGoogle Scholar
- Harvey RJ, Parmar P, Sacks R, Zanation AM: Endoscopic skull base reconstruction of large dural defects: a systematic review of published evidence. Laryngoscope. 2012, 122: 452-459. 10.1002/lary.22475.PubMedView ArticleGoogle Scholar
- Pusic AL, Chen CM, Patel S, Cordeiro PG, Shah JP: Microvascular reconstruction of the skull base: a clinical approach to surgical defect classification and flap selection. Skull Base. 2007, 17 (1): 5-15. 10.1055/s-2006-959331.PubMedPubMed CentralView ArticleGoogle Scholar
- Babin E, Moreau S, Rugy MG, Delmas P, Valdazo A, Bequignon A: Anatomic variations of the arteries of the nasal fossa. Otolaryngol Head Neck Surg. 2003, 128: 236-239. 10.1067/mhn.2003.84.PubMedView ArticleGoogle Scholar
- Lee HY, Kim HU, Kim SS, Son EJ, Kim JW, Cho NH, Kim KS, Lee JG, Chung IH, Yoon JH: Surgical anatomy of the sphenopalatine artery in lateral nasal wall. Laryngoscope. 2002, 112: 1813-1818. 10.1097/00005537-200210000-00020.PubMedView ArticleGoogle Scholar
- Hadar T, Ophir D, Yaniv E, Berger G: Inferior turbinate arterial supply: histologic analysis and clinical implications. J Otolaryngol. 2005, 34: 46-50. 10.2310/7070.2005.03127.PubMedView ArticleGoogle Scholar
- Padgham N, Vaughan-Jones R: Cadaver studies of the anatomy of arterial supply to the inferior turbinates. J R Soc Med. 1991, 84: 728-730.PubMedPubMed CentralGoogle Scholar
- Masing H, Gammert C, Jaumann MP: Our concept concerning treatment of septal perforations. Laryngol Rhinol Otol. 1980, 59: 50-56. 10.1055/s-2007-1008819.View ArticleGoogle Scholar
- Vuyk HD, Versluis RJ: The inferior turbinate flap for closure of septal perforations. Clin Otolaryngol Allied Sci. 1988, 13: 53-57. 10.1111/j.1365-2273.1988.tb00281.x.PubMedView ArticleGoogle Scholar
- Penna V, Bannasch H, Stark GB: The turbinate flap for oronasal fistula closure. Ann Plast Surg. 2007, 59: 679-681. 10.1097/SAP.0b013e318033e88d.PubMedView ArticleGoogle Scholar
- Lee DH, Yoon TM, Lee JK, OO YE, Kim IY, Jang WY, Moon KS, Jung S, Lim SC: Clinical utility of the inferior turbinate flaps in the reconstruction of the nasal septum and skull base. J Craniofac Surg. 2012, 23: e322-e326. 10.1097/SCS.0b013e3182543410.PubMedView ArticleGoogle Scholar
- Harvey RJ, Sheahan PO, Schlosser RJ: Inferior turbinate pedicle flap for endoscopic skull base defect repair. Am J Rhinol Allergy. 2009, 23: 522-526. 10.2500/ajra.2009.23.3354.PubMedView ArticleGoogle Scholar
- Gil Z, Margalit N: Anteriorly based inferior turbinate flap for endoscopic skull base reconstruction. Otolaryngol Head Neck Surg. 2012, 146: 842-847. 10.1177/0194599811434516.PubMedView ArticleGoogle Scholar
- Hadad G, Rivera-Serrano CM, Bassagaisteguy LH, Carrau RL, Fernandez-Miranda J, Prevedello DM, Kassam AB: Anterior pedicle lateral nasal wall flap: a novel technique for the reconstruction of anterior skull base defects. Laryngoscope. 2011, 121: 1606-1610. 10.1002/lary.21889.PubMedView ArticleGoogle Scholar
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