Cadaveric study of the posterior pedicle nasoseptal flap: a novel flap for reconstruction of pharyngeal defects and velopharyngeal insufficiency

Transpalatal Approaches to the Skull Base and Reconstruction: Indications, Technique, and Associated Morbidity

Multiple anterior surgical approaches are available to obtain access to the nasopharynx, clivus, and craniocervical junction. These include the direct and transoral robotic surgery transpalatal, maxillary swing, and endoscopic endonasal approaches. In this article, we describe the indications for these techniques, surgical steps, and associated morbidities. This article is a PubMed literature review. A review of the literature was conducted to assess the techniques, surgical steps, and associated morbidities with transpalatal approaches to the skull base and nasopharynx. The transpalatal approach has been traditionally utilized to obtain surgical access to the nasopharynx, clivus, and craniocervical junction. Morbidity includes velopalatine insufficiency due to shortening of the soft palate from scar contraction or neuromuscular damage, thus leading to hypernasal speech and dysphagia. Middle ear effusion and oronasal or oronasopharyngeal palatal fistula are additional potential morbidities. The choice of surgical approach depends on a variety of factors including the disease location and extent, surgeon experience, and available resources.

Extrapolating the Limits of the Nasoseptal Flap With Pedicle Dissection to the Internal Maxillary Artery

BACKGROUND

The nasoseptal flap is the main pedicled flap used for endoscopic cranial base reconstruction. For large anterior cranial base defects, the anterior edge is a concern for the nasoseptal flap reach.

OBJECTIVE

To present a surgical technique that completely releases the vascular pedicle of the nasoseptal flap from the sphenopalatine artery (SPA) foramen improving considerably the reach of the flap.

METHODS

A patient with left anterior cranial base fracture involving the posterior table of the frontal sinus, who presented with cerebrospinal fluid leak and contused brain herniation to the ethmoid and frontal sinuses. Unilateral endoscopic endonasal anterior cranial base reconstruction was performed with left sided nasoseptal flap. The nasoseptal flap pedicle was dissected and completely released from the SPA foramen. The flap was left attached only to the internal maxillary artery (IMAX) vascular bundle.

RESULTS

The flap covered the entire left anterior cranial base, from the planum sphenoidale to the posterior table of the frontal sinus. There was complete obliteration of the cerebrospinal fluid fistula postoperatively with resolution of the radiographic pneumocephalus and the patient's rhinorrhea.

CONCLUSION

The complete release of the nasoseptal flap pedicle from the SPA foramen is feasible and remarkably improves the reach of the flap. It also increases the reconstructive area of the flap since the entire septal mucosa can be used for reconstruction and the pedicle length is based exclusively upon the SPA/IMAX.

Reconstruction of TORS oropharyngectomy defects with the nasoseptal flap via transpalatal tunnel

The nasoseptal flap (NSF) has been described as reconstructive option for soft palate defects following transoral robotic surgery (TORS). As described, this technique is does not provide adequate coverage of the lateral oropharyngeal wall, parapharyngeal space, exposed vessels, or exposed mandibular bone. The NSF for TORS reconstruction has been limited to soft palate reconstruction, given the limitations on length when passed via the nasopharynx. In this article, we describe (1) a novel technique for TORS reconstruction using direct transposition of the ipsilateral NSF into the oropharynx via a transpalatal tunnel at the hard-soft palate junction, and (2) its use in select patients.

Nasoseptal flap for palatal reconstruction after hemi-maxillectomy: case report

OBJECTIVE

Palatal reconstruction following maxillectomy is a surgical challenge, and a nasoseptal flap is a feasible approach. This paper reports the first known successful clinical case of a nasoseptal pedicle flap applied for the reconstruction of maxillary bone following hemi-maxillectomy.

CASE REPORT

This report describes hemi-maxillectomy in a 60-year-old Italian male diagnosed with stage IV squamous cell carcinoma of the left maxilla. Endoscopic transnasal extended medial maxillectomy was performed, followed by a transoral modified midfacial degloving technique for removal of the maxillary bone. The contralateral nasoseptal pedicle flap was used to reconstruct the defect. The case was followed up prospectively for the assessment of flap reception and healing.

CONCLUSION

The locally accessible nasoseptal flap is a viable alternative for palatal reconstruction; therefore, a second surgical procedure with its associated donor site morbidity can be avoided. Large-scale studies may help in establishing the cosmetic and functional outcomes.

Nasoseptal flap reconstruction after oropharyngeal cancer resection: A case report

RATIONALE

The nasoseptal flap has been widely used to reconstruct skull base defects with excellent success rates. Recently, there were several attempts to use this flap for other defects. Patient concerns: We present the case of the nasoseptal flap reconstruction after oropharyngeal cancer resection.

DIAGNOSIS

The diagnosis of this patient was oropharyngeal T3 squamous cell carcinoma.

INTERVENTIONS

The surgical resection included the right radical tonsillectomy, uvular, and part of the soft palate and hard palate. The nasoseptal flap was sutured to the oropharyngeal defect.

OUTCOMES

In spite of the radiation therapy, the nasoseptal flap was well healed to the oropharyngeal defect.

LESSONS

We suggest that the nasoseptal flap may be a feasible reconstruction option for oropharyngeal defect after oropharyngeal cancer resection.

The radioanatomy of endonasal flap coverage of skull base defects: A tool for preoperative planning

OBJECTIVES/HYPOTHESIS

To develop a tool for the calculation of surgical skull base defects and endonasal flap dimensions on preoperative computed tomography (CT) to aid surgical planning.

STUDY DESIGN

Case series.

METHODS

A literature search was conducted to identify all endonasal flaps. There were five basic models identified. These are the nasoseptal flap, anterior lateral nasal wall flap, bipedicled anterior septal flap, posterior pedicled inferior turbinate flap, and middle turbinate flap. Publications on the radioanatomy of endonasal flaps and surgical skull base defects were also identified. Using these descriptions as a reference, 38 radioanatomic variables were measured on CT scans obtained from 60 preoperative endonasal skull base surgery patients. These were then used to model endonasal flap coverage of six defects: transfrontal, transcribriform, transplanar, transsellar, transsphenoidal, and transclival.

RESULTS

The nasoseptal provides adequate coverage for most defects. The posteriorly pedicled inferior turbinate flap is a good alternative, and provides better coverage of posterior skull base defects. The anterior lateral nasal wall flap is the best choice for transfrontal defects. The middle turbinate flap and bipedicled anterior septal flaps provide secondary options when larger flaps are not available.

CONCLUSIONS

We have developed a simple tool for the calculation of endonasal flap coverage of surgical skull base defects on preoperative CT scans.

LEVEL OF EVIDENCE

4. Laryngoscope, 128:1287-1293, 2018.

Nasoseptal flap for reconstruction after robotic radical tonsillectomy

BACKGROUND

The nasoseptal flap has revolutionized reconstruction of ventral skull base defects. The past decade is also noticeable by the evolution of transoral robotic surgery (TORS). Reconstruction of the oropharyngeal defect is challenging. Good reconstructive options with less cicatricial retraction are desirable and still lacking in the literature.

METHODS

Cadaver dissection and illustrative case are used to show the feasibility of harvesting a nasoseptal flap to reconstruct oropharyngeal defect after radical tonsillectomy. Surgical resection included part of the soft palate and tongue base.

RESULTS

The flap was sufficient to cover two-thirds of the tonsillar defect during the cadaver dissection. In our illustrative case, the flap filled the palatal defect and also was sufficient to cover the superior half of the tonsillar defect.

CONCLUSION

The nasoseptal flap has shown to be feasible and reliable for reconstruction of the oropharyngeal defect after TORS. When soft palate resection is warranted, this flap provides excellent coverage. © 2016 Wiley Periodicals, Inc. Head Neck 38: E2495-E2498, 2016.

Update on surgery for velopharyngeal dysfunction

PURPOSE OF REVIEW

To review journal articles discussing surgery for velopharyngeal dysfunction over the past year. All articles ascertained by a PubMed search relevant to this topic were reviewed.

RECENT FINDINGS

Articles evaluated from the past year discussed the variations, effectiveness, and feasibility of multiple surgical techniques for velopharyngeal dysfunction, including the Furlow palatoplasty, sphincter pharyngoplasty, pharyngeal flap procedure, and other less known novel surgical options. Outcomes, comparisons, and complications were a focus of the majority of the studies. Combinations of the above procedures are also assessed. Nonsurgical options, such as prosthetic devices and pharyngeal augmentation, are mentioned.

SUMMARY

Multiple surgical options exist to assist patients with velopharyngeal dysfunction. The majority of the surgical options can be highly successful. A multispecialty team is critical in providing patients with the most appropriate treatment for their specific situation. Standardized speech and velopharyngeal dysfunction outcome measures are necessary to allow accurate preoperative and postoperative comparisons, intrasurgeon comparisons, and multi-institutional comparisons. Unfortunately, there is a lack of standardization in speech outcome measures among the studies published over the last year. The risk of postoperative obstructive sleep apnea must be assessed and discussed prior to surgery for any patient scheduled to undergo surgery for velopharyngeal dysfunction. Future studies promise to improve our understanding of velopharyngeal dysfunction and provide further guidance as to the best surgical options to assist these patients.