Intraoperative monitoring of marginal mandibular nerve during neck dissection

Effectiveness of Intraoperative Facial Nerve Monitoring in Submandibular Gland Surgery: A Retrospective Study of a Single Institution

BACKGROUND

Intraoperative facial nerve monitoring (IFNM) is becoming increasingly prevalent as an established intraoperative aid in parotid gland surgery. To date, however, there are few scientific studies on the postoperative outcomes of submandibular gland surgery, particularly on the postoperative injury of the marginalis mandibulae branch (MMB) of the facial nerve (FN). This branch represents the most frequent and feared complication of this surgery, with an incidence of 1-7% of cases.

OBJECTIVE

This retrospective study aims to evaluate the incidence of postoperative MMB paralysis in patients undergoing submandibular sialoadenectomy for benign conditions from 2014 to 2023, focusing on the role of IFNM.

MATERIALS AND METHODS

The patients were divided into two groups: the subjects of Group 1 (G1) had undergone submandibular sialoadenectomy after identification and clamped facial vessels, without the aid of IFNM (from 1 January 2014 to 31 December 2018). Conversely, subjects in Group 2 (G2) underwent IFNM procedures (from 1 January 2019 to 31 December 2023). The classification of any FN malfunctions was conducted following the House-Brackmann grading system. A descriptive analysis was performed, and univariate and multivariate logistic regressions were used to examine the impact of IFNM on surgical timing and the association between G2 deficit (vs. G1) corrected for age, sex, and smoking status.

RESULTS

The study population comprised a total of 101 patients with a mean age of 55 ± 16 years. The sample population comprised 50 subjects assigned to Group 1 (49.5%, 24 females and 26 males) and 51 subjects assigned to Group 2 (50.5%, 21 males and 30 females). Postoperative paralysis of the MMB occurred in 23 subjects (22.77%), including 12 of G1 (4 had a grade II and 8 grade III dysfunction) and 11 of G2 (8 had a grade II and 3 grade III dysfunction). A six-month evaluation revealed that only five patients in G1, previously diagnosed with grade II dysfunction, exhibited a residual deficit. The mean surgical time for the entire patient cohort was 99 ± 44 min: 110 ± 43 min for Group 1 and 92 ± 42 min for Group 2 (Beta = -19; 95% CI -37 at -0.16; p-value = 0.048). Furthermore, a longer operative time was observed in smokers than in non-smokers (p-value = 0.008), suggesting that smoking affects the length of surgery (Beta = 0.32; 95% CI -0.08 to -0.55).

DISCUSSION AND CONCLUSIONS

MMB paralysis is one of the most prevalent complications that may arise in submandibular gland surgery. IFNM provides surgeons with a valuable tool for identifying MMB in submandibular sialoadenectomy. The efficacy of IFNM as an aid is contingent upon the expertise of the operating surgeon.

Spontaneous neck haemorrhage secondary to parathyroid adenoma: description of a case and systematic review

Introduction

Parathyroid adenomas can rarely cause spontaneous haemorrhage, which can be life-threatening. Diagnosis is challenging. We present a case and systematic review to define a clearer pattern of symptoms, diagnosis, and treatment.

Materials and methods

We conducted a literature search of PubMed, Google Scholar, and Embase using PRISMA guidelines, identifying 38 relevant case reports on spontaneous neck bleeding or haematoma caused by parathyroid adenomas from 1974 to 2020. Data included epidemiology, clinical features, and treatment. One patient treated at our clinic is described.

Results

Reviewing 38 articles, we found cervical haematomas from spontaneous bleeding of parathyroid adenoma in 45 patients, comprising 33 women and 12 men. Common symptoms were neck pain, dysphagia, and swelling. Surgery was the primary treatment, with 4.4% requiring tracheotomy. Average hospital stay was 12.5 days, which was mostly complication-free.

Conclusions

Parathyroid adenoma haemorrhage in middle-aged women with neck swelling, pain, and swallowing difficulty should be suspected. Diagnosis involves blood tests and contrast CT. Treatment is adenoma removal, typically without major complications.

Pre-vascular Facial Nodes: Sentinel Station for Metastasis in Gingivobuccal Complex Cancers

BACKGROUND

Pre-vascular facial nodes (PV-FNs; perifacial lymph nodes) are supra-mandibular lymph nodes above the inferior border of the mandible. These are not part of routine neck dissection done for OCSCC. These lymph nodes can be sentinel station for metastatic lymph nodes from gingivobuccal complex cancers and are missed during routine neck dissection. It is imperative to include this sentinel station in routine neck dissection to prevent nodal recurrences.

MATERIALS AND METHODS

One hundred thirty-seven patients with GBCC (T1-T4) were prospectively recruited between May 2020 and June 2022 with the intent to evaluate the incidence of PV-FN metastases and clinicopathological factors predicting them.

RESULTS

PV-FN metastases were seen in 26 patients (18.9%; 26/137). The occult metastasis rate was 8.7% (12/137). On multivariate analysis, pathological T4 stage (pT4), LVE positivity, and intermediate-high BGS were statistically significant predictors of PV-FN metastases in our study.

CONCLUSIONS

Incidence of PV-FN metastasis is high (18.9%) in GBCC, which can be potentially the first sentinel station in the lymphatic drainage pattern for this sub-site. Meticulous clearance of this nodal basin is of paramount importance during neck dissection to prevent nodal recurrences.

LEVEL OF EVIDENCE

2 (CEBM-Level of Evidence-2.1) Laryngoscope, 135:148-152, 2025.

Multidisciplinary therapeutic strategy with appropriate timing and modalities for treating cervicofacial lymphatic malformations in children

PURPOSE

The study reviewed a multidisciplinary approach to treating cervicofacial lymphatic malformations (CFLMs) in children.

METHODS

Between 2007 and 2023, 53 children with CFLMs were treated with the median on-set age of 5 months (0-165) at our institute. For infants, airway management, including possible tracheotomy was prioritized, and a "wait-and-see" policy was adopted to expect spontaneous regression. Once children reached one year of age or diagnosed after infancy, OK-432 sclerotherapy and surgical treatment with/without sirolimus were considered for residual lesions.

RESULTS

The median follow-up period was 38 months (0-169). Among 30 infants, tracheostomy was performed in 4 patients, with 3 successfully closed after treatment. Thirteen patients showed excellent improvement without treatment. Sclerotherapy was performed in 15 patients, and partial resection in 5. Six patients were treated with sirolimus and showed moderate shrinkage or cessation of bleeding. Overall, 23 of 30 infants showed moderate to excellent improvement. For the 23 patients diagnosed after infancy, 16 improved without treatment, and 7 showed moderate to excellent improvement with sclerotherapy.

CONCLUSIONS

The study concluded that early sclerotherapy for infants, particularly around the airway, poses risks, and tracheostomy might be necessary. The comprehensive strategy including "wait-and-see," sclerotherapy, sirolimus treatment, and timely surgery significantly improved the patients' quality of life.

Perimarginal quadrangle dissection: Pushing the boundaries of neck dissection in gingivo-buccal complex cancer

OBJECTIVES

Perimarginal nodes (PMN) lie in close relationship with marginal mandibular nerve (MMN), in the lymphatic drainage pathway of gingivo-buccal cancers (GBC), above the lower border of mandible and remain unaddressed in conventional neck dissection. We have aimed to define the boundaries of perimarginal node dissection, explore incidence of PMN metastasis and its correlation with histopathological characteristics.

MATERIALS AND METHODS

A prospective study was conducted on 112 consecutive patients of GB carcinoma. PMN dissection was performed in an anatomically defined quadrangle. Prospective clinical characteristics included subsite, tumor and nodal stage, location of primary and clinical skin involvement. Histopathological characteristics analyzed included grade, size, pathological tumor, nodal stage, skin and/or bone involvement, depth of invasion, Brandwein Gensler histological risk score and lympho-vascular emboli. MMN function was graded at 3 and 6 months post-operatively.

RESULTS

The PMN were identified histologically in 75.89 % patients. 15.2 % patients harboured metastasis in PMN. 16.7 % patients had clinically occult metastasis with 11.7 % having isolated PMN metastasis. None of the pre-operative clinical factors was found to be significant in predicting incidence of metastasis. Higher nodal burden (p = 0.01) and pathological skin involvement (p = 0.03) were found statistically significant on multivariable analysis. At 6 months follow-up, none of the patients had any MMN functional deformity at rest.

CONCLUSION

There is a high incidence of occult PMN metastasis from gingivo-buccal complex cancer. High nodal stage and pathological skin involvement are independent predictors for PMN metastasis. PMN dissection must be performed in all cases of GB cancer.

Elective management of the N0 neck in maxillary sinus squamous cell carcinoma

OBJECTIVES

To demonstrate adequacy of radiation therapy alone to the neck in patients with maxillary sinus squamous cell carcinoma (MS-SCC) without clinical evidence of regional metastasis.

METHODS

Retrospective review between 2000 and 2018 from a single high-volume tertiary academic head and neck cancer center of all patients with MS-SCC.

RESULTS

A total of 55 patients were treated for MS-SCC at our center. A clinically uninvolved neck on presentation was found in 46 patients (83.6%) in the initial dataset. Of the 39 patients with radiologic N0 disease who were treated with primary surgical resection, 15.4% (6 patients) did not undergo any treatment of the neck, 2.6% (1 patient) underwent a neck dissection only, 69.2% (27 patients) received RT only, and 12.8% (5 patients) were treated with both a neck dissection followed by RT. Median follow-up was 26 months (mean 48 months, interquartile range 9-76 months). Five-year overall survival of all patients with N0 necks treated with upfront surgical resection was 46.5% (95% CI, 32.3%-66.9%). No patients with N0 necks had isolated regional recurrence regardless of neck management.

CONCLUSIONS

Regional recurrence is rare for patients with radiologic N0 MS-SCC. Single-modality elective neck radiation provides excellent regional disease control in these patients.

Discerning a smile - The intricacies of analysis of post-neck dissection asymmetry

INTRODUCTION

Iatrogenic facial nerve palsy is distressing to the patient and clinician. The deformity is aesthetically displeasing, and can be functionality problematic for oral competence, dental lip trauma and speech. Furthermore such injuries have litigation implications. Marginal mandibular nerve (MMN) palsy causes an obvious asymmetrical smile. MMN is at particular risk during procedures such as rhytidoplasties, mandibular fracture, tumour resection and neck dissections. Cited causes for the high incidence are large anatomical variations, unreliable landmarks, an exposed neural course and tumour grade or nodal involvement dictating requisite nerve sacrifice. An alternative cause for post-operative asymmetry is damage to the cervical branch of the facial nerve or platysmal dysfunction due to its division. The later tends to have a transient course and recovers. Distinction between MMN palsy and palsy of the cervical branch of the facial nerve or platysma division should therefore be made. In 1979 Ellenbogen differentiated between MMN palsy and "Pseudo-paralysis of the mandibular branch of the facial nerve". Despite this, there is paucity in the literature & confusion amongst clinicians in distinguishing between these palsies, and there is little regarding these post-operative sequelae and neck dissections.

METHOD

This article reflects on the surgical anatomy of the MMN and cervical nerve in relation to danger zones during lymphadenectomy. The authors review the anatomy of the smile. Finally, case studies are utilised to evaluate the differences between MMN palsy and its pseudo-palsy to allow clinical differentiation.

CONCLUSION

Here we present a simple method for clinical differentiation between these two prognostically different injuries, allowing appropriate reassurance, ongoing therapy & management.

Relevance of perimarginal nodes for head and neck cancer

OBJECTIVE

To estimate the prevalence of metastasis in the perimarginal nodes (PMNs) (also known as perifacial, preglandular and retroglandual nodes) in head and neck cancer.

METHODS

We recruited 136 patients affected by cancers of the oral cavity, lip, oropharynx, skin and by cáncer of unknown primary (CUP), who were candidates for level IB dissection. PMNs were identified and sent separately for histological analysis. Correlation between metastasis to the PMNs and characteristics of the primary tumour were reported.

RESULTS

The incidence of metastasis was 17% from oral cancer, 50% from lip cancer and 12.5% from skin cancer. No metastases were reported for oropharynx cancer or CUP. The only factor that correlated with the incidence of metastases was origin of the tumour from the upper part of oral cavity.

CONCLUSION

PMNs represent a frequent site of metastasis in oral and lip cancers. In cancer of the oropharynx, their involvement has not been not reported, while their role in skin cancers remains to be clarified.

Surgical Skills and Technological Advancements to Avoid Complications in Lateral Neck Dissection for Differentiated Thyroid Cancer

Neck dissection is a surgical procedure reserved for thyroid cancer cases with clinically evident lymphatic invasion. Although neck dissection is a reliable and safe procedure, it can determine a significant morbidity involving a variety of structures of nervous, vascular and endocrine typology. A careful pre-operative study is therefore essential to better plan surgery. Surgical experience, combined with accurate surgical preparation and merged with adequate and specific techniques, can certainly help reduce the percentage of complications. In recent years, however, technology has also proved to be useful. Its crucial role was already recognized in the safeguard of the integrity of the laryngeal nerve through neuro-monitoring, but new technologies are emerging to help the preservation also of the parathyroid glands and other structures, such as the thoracic duct. These surgical skills combined with the latest technological advancements, that allow us to reduce the incidence of complications after neck dissection for thyroid cancer, will be reported in the present article. This topic is of significant interest for the endocrine and metabolic surgeons' community.

Accuracy of the Anatomage Table in detecting extranodal extension in head and neck cancer: a pilot study

Purpose: To assess whether the three-dimensional reconstructions of preoperative computed tomography (CT) scans are helpful for establishing extranodal extension (ENE) in head and neck carcinoma. Approach: Patients with a histological diagnosis of ENE ( pENE + ) were considered "cases" and patients with negative histological examination for ENE ( pENE - ) were considered "controls." Cases and controls were divided into two groups: a major nodes (MaN) group (lymph nodes on CT > 15    mm ) and a minor nodes (MiN) group (lymph nodes on CT ≤ 15    mm ). The preoperative CT scans were uploaded to the Anatomage Table and were randomly and blindly provided to the radiologist for assessment. The findings at the Anatomage Table were compared with those of CT and magnetic resonance imaging (MRI) scans. Results: Analysis of data from the MaN group showed that the Anatomage Table had a higher percentage of concordance with histopathological examination (90%) than the CT and MRI scans. The Anatomage Table had 100% sensitivity in identifying all pENE + patients, associated with a lower specificity. The negative predictive value of 100% allowed identification of pENE - patients. In the MiN group, on the other hand, sensitivity was lower, related to a high number of false-negative results. Conclusions: The Anatomage Table could represent a useful tool for preoperatively establishing the extranodal extension of cervical lymph node metastasis.

Surgical Anatomy of the Marginal Mandibular Nerve: A Systematic Review and Meta-Analysis

The high number of marginal mandibular nerve (MMN) anatomical variants have a well-known clinical significance due to the risk of nerve injury in several surgical procedures. The aim of this study was to find and systematize the available anatomical data concerning this nerve. The PubMed and Scopus databases were investigated in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-analyses guidelines. All studies reporting extractable data on the origin, course, splitting, anastomosis and relationship of the MMN with the mandible or the facial vessels were included. We included 28 studies analyzing 1861 halves. The MMN had one (PP = 35% 95% CI:18-54%), two (PP =35% 95% CI:18-54%), three (PP = 18% 95% CI:0-35%), or four branches (PP = 2% 95% CI:0-8%). Anastomosis with the great auricular nerve, transverse cervical nerve, mental nerve, and other branches of the facial nerve were defined. The origin of the MMN in relation to the parotid and the mandible was variable. The MMN nearly always crossed the anterior facial vein laterally (PP = 38% 95% CI:9-72% if single, PP = 57% 95% CI:22-90% when multiple); its relation with other vessels was less constant. At least one branch of the MMN was found below the inferior border of the mandible (IBM), with a PP of 39% (95% CI:30-50%). The MMN has high anatomical variability and it is more often represented by one or two branches; its origin is frequently described at the parotid apex and above the IBM, although in its course at least one branch often runs below the IBM. Its most frequent anastomosis is with the buccal branch of the facial nerve. Clin. Anat., 33:739-750, 2020. © 2019 Wiley Periodicals, Inc.

Perimarginal lymph nodes: an undervalued entity in oral cancer

PURPOSE

In a previous study, we gave a surgical description of a group of lymph nodes in the submandibular area at risk of remaining undissected during neck dissection (ND) for which we have proposed the term "perimarginal nodes" (PMNs) due to their proximity to marginal mandibular nerve (MMN). The aim of this study is to evaluate prevalence of PMNs involvement in oral cavity squamous cell cancer (OCSCC) and to verify if metastases are related to primary tumor characteristics or to the state of the neck.

METHODS

We recruited a total of 39 consecutive patients diagnosed with OCSCC candidate to ND. Histological characteristics of PMNs were analyzed and the incidence of metastases in relation to the primary tumor characteristics were noted.

RESULTS

PMNs were found to be involved with metastases in 8 patients (20.5%). No characteristic of the primary tumor seems to influence the metastatic involvement of the PMNs.

CONCLUSIONS

PMNs represent a frequent site of micro-metastases in patients diagnosed with OCSCC regardless of other characteristics of the primary tumor.