Adam Luginbuhl

Endoscopic repair of high‐flow cranial base defects using a bilayer button

Repair of the skull base still begins with a direct repair of the dural defect. We present a new button closure for primary repair of the dura for high flow defects.

Endocrinological and ophthalmological consequences of an initial endonasal endoscopic approach for resection of craniopharyngiomas.

OBJECT The expanded endoscopic approach to craniopharyngiomas has recently been described in several small case series. The authors present their experience with this technique and review the available literature. METHODS Between September 2006 and September 2009, 14 patients underwent a purely endoscopic, endonasal approach for resection of newly diagnosed craniopharyngiomas. These procedures represent index surgeries; no patient had undergone previous tumor resection. A retrospective review of endocrinological and ophthalmological outcomes, extent of resection, and complication prevalence was completed. Additionally, a review of the English literature was performed to evaluate outcomes of similar endoscopic techniques for resection of craniopharyngiomas. RESULTS Four patients (28.6%) underwent gross-total resection; near total resection or better was achieved in 9 patients (64.3%). All patients presented with some form of visual field or acuity deficit. Postoperatively, 12 patients (85.7%) experienced visual improvement, with 6 patients (42.9%) having complete visual recovery. One patient experienced worsening of her visual deficit. Visual acuity improved in 8 patients ((57.1%), while visual field defects improved in 11 (78.6%). The pituitary stalk was preserved in all cases. Eight (57.1%) of 14 patients experienced some form of anterior pituitary dysfunction postoperatively. Although 9 patients (64.3%) were documented to have either transient or permanent new diabetes insipidus immediately after surgery, at 1-month follow-up only 1 patient met clinical criteria. Five patients (35.7%) developed CSF leaks that were successfully treated by subsequent endoscopic revision. All CSF leaks occurred early in the series. Two patients (14.2%) were treated for presumed meningitis postoperatively. CONCLUSIONS The endoscopic endonasal approach is a minimally invasive alternative to open transcranial approaches for select craniopharyngiomas. Similar to previous transcranial series, rates of endocrinopathy and gross-total resection were dependent upon the adherence of the tumor capsule to the hypothalamus, pituitary stalk, and associated vasculature. A review of the literature suggests that the results of the current series are similar to other published series on this topic.

Detection of evolving injury to the brachial plexus during transaxillary robotic thyroidectomy.

Continuous intraoperative neuromonitoring (IONM) of transcranial electric motor evoked potentials (tceMEPs) and somatosensory evoked potentials (SSEPs) has gained universal acceptance as an efficacious method for detecting emerging positional brachial plexopathy or peripheral nerve compression during spinal and shoulder surgery. This has implications for transaxillary thyroid surgery.

Early Adoption of Transoral Robotic Surgical Program Preliminary Outcomes

Objective The objective of this study is to demonstrate the feasibility and safety of establishing a transoral robotic surgical (TORS) program in the post–Food and Drug Administration (FDA) approval setting. Early outcomes are compared with the previously reported results of pioneering centers. Study Design Clinical data from a prospective TORS study. Setting Academic university institution. Subjects and Methods Sixty-one patients treated with 63 TORS procedures. Main outcome measures: intraoperative times, margin status, complications, time to diet, and percutaneous endoscopic gastrostomy (PEG) tube retention rate. The authors also report oncologic outcomes on their first 30 patients. Results The spectrum of subsites included tongue base, tonsil, parapharyngeal space, retromolar trigone, supraglottis, and posterior pharyngeal wall. Surgical console time averaged 79 ± 53 minutes. After re-resection of 4 patients, final negative margin status was 94% (50/53). A subset of 30 patients with squamous cell carcinoma reaching an average of 18 months of follow-up had a local regional control rate of 97% with a disease-free survival rate of 90%. The PEG tube retention rate was 7%. Complications included 2 readmissions with dehydration, 1 aspiration pneumonia, and 2 with minor oropharyngeal bleeding. Ninety-one percent of patients resumed an oral diet by the first postoperative visit. Conclusion The initiation of a TORS program in the post-FDA setting can be achieved in a safe and efficient manner. Early results of pioneering TORS centers are reproducible. Continued investigation of TORS as a treatment option for oropharygneal carcinoma is warranted.

Assessment of Microvascular Anastomosis Training in Otolaryngology Residencies: Survey of United States Program Directors

16 (62%) of the labs were sponsored by otolaryngology departments with 6 (23%) supported by general surgery and the remainder from other sources. Albeit somewhat smaller than human vessels (0.5-1.0 mm vs. 1.95-2.95mm average inner diameters), rat femoral vessels are most commonly employed in training techniques. Thus, while providing the optimum tactile replication, rat vessels prove to be a formidable and challenging training model.

Prevalence, Morphology, and Prognosis of Human Papillomavirus in Tonsillar Cancer

Objectives: We sought to identify the prevalence of human papillomavirus (HPV) in tonsillar squamous cell carcinoma, and to examine the relationship of HPV to prognosis and tumor morphology. Methods: We performed in situ hybridization for HPV and retrospective clinical outcome analysis. Results: Of the 48 patients with tonsillar carcinoma, in situ hybridization identified 35% as HPV-positive tumors. Age-matched controls had no evidence of HPV. There was no significant difference between HPV-positive and HPV-negative patients regarding age (p = 0.34), tobacco consumption (p = 0.59), alcohol consumption (p = 0.91), or treatment method (p = 0.39). Forty-four patients were eligible for outcome analysis. The overall rate of recurrence in this population was 25%, and the disease-specific survival rate was 84%. There was no significant difference between the two groups either in the incidence of recurrence (p = 0.14) or in the disease-specific survival rate (p = 0.19). HPV-associated tumors developed from the tonsillar crypts significantly more frequently than did HPV-negative tumors (p = 0.01). Conclusions: As previously described, HPV is significantly associated with squamous cell carcinoma of the tonsil; however, HPV status in our series did not correlate with clinical outcome. Morphologically, we found that HPV-positive tumors had their origin in the tonsillar crypts, whereas HPV-negative tumors arose from the surface epithelium.

Prognostic Indications of Elevated MCT4 and CD147 across Cancer Types: A Meta-Analysis

Background. Metabolism in the tumor microenvironment can play a critical role in tumorigenesis and tumor aggression. Metabolic coupling may occur between tumor compartments; this phenomenon can be prognostically significant and may be conserved across tumor types. Monocarboxylate transporters (MCTs) play an integral role in cellular metabolism via lactate transport and have been implicated in metabolic synergy in tumors. The transporters MCT1 and MCT4 are regulated via expression of their chaperone, CD147. Methods. We conducted a meta-analysis of existing publications on the relationship between MCT1, MCT4, and CD147 expression and overall survival and disease-free survival in cancer, using hazard ratios derived via multivariate Cox regression analyses. Results. Increased MCT4 expressions in the tumor microenvironment, cancer cells, or stromal cells were all associated with decreased overall survival and decreased disease-free survival (p < 0.001 for all analyses). Increased CD147 expression in cancer cells was associated with decreased overall survival and disease-free survival (p < 0.0001 for both analyses). Few studies were available on MCT1 expression; MCT1 expression was not clearly associated with overall or disease-free survival. Conclusion. MCT4 and CD147 expression correlate with worse prognosis across many cancer types. These results warrant further investigation of these associations.

Current Management of Locally Advanced Head and Neck Cancer: The Combination of Chemotherapy With Locoregional Treatments

This review will discuss the evolution of the role of chemotherapy in the treatment of locally advanced head and neck cancer (HNC), over the last few decades. Studies were identified by searching PubMed electronic databases. Surgery followed by radiotherapy (RT) or definitive RT are potentially curative approaches for locally advanced HNC. While chemotherapy itself is not curative, it can improve cure rates when given as an adjunct to RT. The benefit of combining chemotherapy with RT is related to the timing of the chemotherapy. Several prospective randomized trials have demonstrated that concurrent delivery of chemotherapy and RT (CRT) is the most promising approach, given that locoregional recurrence is the leading pattern of failure for patients with locally advanced HNC. Induction chemotherapy before CRT has not been shown to be superior to CRT alone and the added toxicity may negatively impact the compliance with CRT. Sequential chemotherapy administration, in the form of induction chemotherapy followed by RT or CRT, has been successful as a strategy for organ preservation in patients with potentially resectable laryngeal and hypopharyngeal cancer. Systemic chemotherapy delivered concurrently with RT is used as a standard treatment for locally advanced HNC.

Effectiveness of PET/CT in the preoperative evaluation of neck disease

To evaluate the utility of positron emission tomography (PET)/computed tomography (CT) for staging the neck in the preoperative setting by comparing it to both CT/magnetic resonance imaging (MRI) and pathologic staging.

Metformin effects on head and neck squamous carcinoma microenvironment: window of opportunity trial

The tumor microenvironment frequently displays abnormal cellular metabolism, which contributes to aggressive behavior. Metformin inhibits mitochondrial oxidative phosphorylation, altering metabolism. Though the mechanism is unclear, epidemiologic studies show an association between metformin use and improved outcomes in head and neck squamous cell carcinoma (HNSCC). We sought to determine if metformin alters metabolism and apoptosis in HNSCC tumors.