Publications by authors named "Alexis Moles"

9 Publications

  • Page 1 of 1

Effective accuracy of stereoelectroencephalography: robotic 3D versus Talairach orthogonal approaches.

J Neurosurg 2018 Dec;131(6):1938-1946

1Department of Neurosurgery, Neurology & Neurosurgery Hospital Pierre Wertheimer, Hospices Civils de Lyon, Lyon, France.

Objective: Stereoelectroencephalography (SEEG) was first developed in the 1950s by Jean Talairach using 2D angiography and a frame-based, orthogonal approach through a metallic grid. Since then, various other frame-based and frameless techniques have been described. In this study the authors sought to compare the traditional orthogonal Talairach 2D angiographic approach with a frame-based 3D robotic procedure that included 3D angiographic interoperative imaging guidance. MRI was used for both procedures during surgery, but MRI preplanning was done only in the robotic 3D technique.

Methods: All study patients suffered from drug-resistant focal epilepsy and were treated at the same center by the same neurosurgical team. Fifty patients who underwent the 3D robotic procedure were compared to the same number of historical controls who had previously been successfully treated with the Talairach orthogonal procedure. The effectiveness and absolute accuracy, as well as safety, of the two procedures were compared. Moreover, in the 3D robotic group, the reliability of the preoperative MRI to avoid vascular structures was evaluated by studying the rate of trajectory modification following the coregistration of the intraoperative 3D angiographic data onto the preoperative MRI-based trajectory plans.

Results: Effective accuracy (96.5% vs 13.7%) and absolute accuracy (1.15 mm vs 4.00 mm) were significantly higher in the 3D robotic group than in the Talairach orthogonal group. Both procedures showed excellent safety results (no major complications). The rate of electrode modification after 3D angiography was 43.8%, and it was highest for frontal and insular locations.

Conclusions: The frame-based, 3D angiographic, robotic procedure described here provided better accuracy for SEEG implantations than the traditional Talairach approach. This study also highlights the potential safety advantage of trajectory planning using intraoperative frame-based 3D angiography over preoperative MRI alone.
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December 2018

SEEG-guided radiofrequency coagulation (SEEG-guided RF-TC) versus anterior temporal lobectomy (ATL) in temporal lobe epilepsy.

J Neurol 2018 Sep 26;265(9):1998-2004. Epub 2018 Jun 26.

Department of Neurosurgery, Hospices Civils de Lyon, Neurology and Neurosurgery Hospital Pierre Wertheimer, 59, Bd Pinel, 69677, Bron, France.

Background: Stereoelectroencephalography-guided radiofrequency thermocoagulation (SEEG-guided RF-TC) is a super-selective procedure. Hippocampus has a limited volume and is widely accessible to SEEG so that SEEG-guided RF-TC could be an alternative to the anterior temporal lobectomy (ATL) in case of temporal lobe epilepsy (TLE) syndrome.

Objective: To compare seizure-free rate at 1-year follow-up between patients undergoing SEEG-guided RF-TC and patients undergoing ATL in TLE over a 15-year period.

Methods: All patients had a drug-resistant epilepsy and underwent SEEG after non-conclusive phase I investigations suspecting a TLE. Two groups were selected according to the procedure which the patients underwent (ATL or SEEG-guided RF-TC); TLE had to be confirmed by SEEG in the two groups. The primary outcome was seizure freedom at 1 year. The secondary outcome was response (at least 50% reduction of seizure frequency) at 1 year. In case of persistent seizures after SEEG-guided RF-TC, ATL was performed.

Results: A total of 21 patients underwent SEEG-guided RF-TC and 49 ATL. At 12 months, none of the patients of the SEEG-guide RF-TC group was seizure free, while 37 (75.5%) in the ATL group were so (p < 0.001). Ten patients (47.6%) were responders after 12 months of follow-up after SEEG-guided RF-TC; all patients in the ATL group who were seizure free were responders.

Conclusion: SEEG-guided RF-TC is not as effective as ATL in TLE. As no memory impairment following SEEG-guided RF-TC was found, patients with dominant mesial involvement for whom hippocampectomy is not an option could benefit from the technique.
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September 2018

Rare Coding Variants in ANGPTL6 Are Associated with Familial Forms of Intracranial Aneurysm.

Am J Hum Genet 2018 01;102(1):133-141

INSERM, CNRS, UNIV Nantes, l'institut du thorax, 44007 Nantes, France; CHU Nantes, l'institut du thorax, 44093 Nantes, France. Electronic address:

Intracranial aneurysms (IAs) are acquired cerebrovascular abnormalities characterized by localized dilation and wall thinning in intracranial arteries, possibly leading to subarachnoid hemorrhage and severe outcome in case of rupture. Here, we identified one rare nonsense variant (c.1378A>T) in the last exon of ANGPTL6 (Angiopoietin-Like 6)-which encodes a circulating pro-angiogenic factor mainly secreted from the liver-shared by the four tested affected members of a large pedigree with multiple IA-affected case subjects. We showed a 50% reduction of ANGPTL6 serum concentration in individuals heterozygous for the c.1378A>T allele (p.Lys460Ter) compared to relatives homozygous for the normal allele, probably due to the non-secretion of the truncated protein produced by the c.1378A>T transcripts. Sequencing ANGPTL6 in a series of 94 additional index case subjects with familial IA identified three other rare coding variants in five case subjects. Overall, we detected a significant enrichment (p = 0.023) in rare coding variants within this gene among the 95 index case subjects with familial IA, compared to a reference population of 404 individuals with French ancestry. Among the 6 recruited families, 12 out of 13 (92%) individuals carrying IA also carry such variants in ANGPTL6, versus 15 out of 41 (37%) unaffected ones. We observed a higher rate of individuals with a history of high blood pressure among affected versus healthy individuals carrying ANGPTL6 variants, suggesting that ANGPTL6 could trigger cerebrovascular lesions when combined with other risk factors such as hypertension. Altogether, our results indicate that rare coding variants in ANGPTL6 are causally related to familial forms of IA.
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January 2018

Long-Term Follow-Up Comparative Study of Hydroxyapatite and Autologous Cranioplasties: Complications, Cosmetic Results, Osseointegration.

World Neurosurg 2018 Mar 24;111:e395-e402. Epub 2017 Dec 24.

Neurosurgery and Neurotraumatology Department, Nantes University Hospital, Nantes, France; Pain, Neuromodulation, and Quality of Life, INSERM EA3826, Nantes, France.

Objective: A three-dimensional reconstruction technique using the CustomBone (CB) prosthesis allows custom-made cranioplasty (CP) possessing osseointegration properties owing to its porous hydroxyapatite (HA) composition. This reconstruction technique has replaced less expensive techniques such as subcutaneously preserved autologous bone (SP). Our primary objective was to evaluate complications between CB and SP CP techniques. A secondary objective was to assess cosmetic results and osseointegration of CPs.

Methods: This single-center study comprised patients undergoing delayed CB or SP CP after craniectomy between 2007 and 2014. A prospective interview was conducted to collect all data, including 2-year follow-up clinical and radiologic data. Cosmetic results were assessed by a qualitative score, and osseointegration was assessed by measuring relative fusion at the CP margins.

Results: Of 100 patients undergoing CB or SP CP between 2007 and 2014, 92 (CB, n = 44; SP, n = 48) participated in the prospective interview. No significant difference in complication rates was observed between the 2 groups. The main complication specific to the CB group was fracture of the prosthesis observed in 20.8% patients. A higher rate of good cosmetic results was observed in the CB group (92.5% vs. 74.3%, P = 0.031). In the CB group, 51% of patients demonstrated no signs of bone fusion of the CP.

Conclusions: Although the CB prosthesis is associated with cosmetic advantages, the porous hydroxyapatite composition makes it fragile in the short-term and long-term, and effective osseointegration remains uncertain.
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March 2018

Non neurologic burst thoracolumbar fractures fixation: Case-control study.

Injury 2017 Oct 4;48(10):2150-2156. Epub 2017 Aug 4.

Department of Neurotrauma/Neurosurgery, Nantes University Hospital, France.

Study Design: Burst fractures not associated with any neurological deficits are frequent but not therapeutic agreement on their management is available to date. This case-control study was conducted to try to help guide therapeutic decision in the treatment of such fractures.

Materials And Methods: This case-control study includes consecutive retrospective evaluation of 25 case-patients treated by posterior short-segment fixation associated with kyphoplasty (SFK) in the treatment of A3 thoracolumbar unstable fractures, as compared to a control-group composed of 82 patients treated by long-segment (LF) pedicle screws.

Results: SFK patients bled significantly less than the LF patients (p=0.04). Assessment of deformation progression, vertebral height restoration and reduction of the regional kyphotic angle in the SFK and LF groups revealed no statistically significant superiority of one approach on another. In contrast, the height of endplates was significantly increased in the SFK group (p=0.006). The patients' pain levels were significantly improved in the SFK group (p=0.002). However, patients from the SFK group stood earlier postoperatively (1.7 vs 3.7days, p=0.001).

Conclusion: We believe that SFK in vertebral fractures is as efficient as LF for bone consolidation and spine stabilization. In addition, SFK patients may use fewer analgesics.
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October 2017

Predictors of survival in patients with surgical spine multiple myeloma metastases.

Surg Oncol 2016 Sep 20;25(3):178-83. Epub 2016 May 20.

Department of Neurotrauma/Neurosurgery, Nantes University Hospital, France.

Background: Multiple myeloma (MM) is the most common primary malignant tumor of the spine and bone. Spinal metastases are part of the evolution and progression of the MM disease. Therefore, this study aims at investigating prognostic factors associated with overall survival (OS) in patients with symptomatic spine MM metastases.

Methods: Consecutive spine surgery procedures were performed in the largest series reported to date and comprising 51 patients with osteolytic vertebral compression fractures resulting from MM, diagnosed by either bone marrow or tumor biopsy.

Results: The mean age of patients was 61.1 years and mean follow-up was 31.9 months. Through univariate analyses, ISS stage (p < 0.0001), preoperative spine instability (SINS score) (p < 0.03), posterior osteosynthesis fixation (p < 0.002), preoperative adjuvant therapy (p < 0.02), postoperative adjuvant treatment (p < 0.001), bone marrow transplant (p < 0.03) and newly MM diagnosed (p < 0.03) emerged as powerful predictors of survival. Cox multivariate proportional hazard model indicated that only ISS Stage and stabilization surgery such as osteosynthesis were two independent predictive factors for OS [hazard ratio (HR): 0.268, 95% confidence interval (CI) 0.07-0.536; p < 0.006 for the former and HR: 0.184, 95% confidence interval (CI) 0.03-0.89; p < 0.04 for the latter].

Conclusion: Stabilization surgery combined to ISS staging should be considered as an important prognostic survival factor for patients with symptomatic MM spine metastases.
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September 2016

Overall Survival in Spine Myeloma Metastases: Difficulties in Predicting With Prognostic Scores.

Spine (Phila Pa 1976) 2017 Mar;42(6):400-406

Department of Neurotrauma/Neurosurgery, Nantes University Hospital, Nantes, France.

Study Design: Fifty-one patients with spinal multiple myeloma (MM) metastases were operated and followed between January 2004 and July 2014.

Objective: The aim of this study was to consider the efficiency of surgical prognosis scores in the management of spinal metastases myelomas.

Summary Of Background Data: The spine is the most common site of bone metastases in MM. Surgery in spine metastases MM is a matter of debate and its impact on the increase of a patient's survival time is not clear. Several surgical survival scores have been developed to determine the best treatment in these patients.

Methods: We studied 51 patients operated for spinal MM metastases between January 2004 and July 2014. We determined the Tokuhashi and Tomita survival scores and compared them with documented patient survivals. The two scores were also compared with the International Staging System (ISS).

Results: Median survival (MS) was 108 months [standard deviation (SD) 62] for ISS I, 132.2 (SD 40) for ISS II, and 45.5 months (SD 16.3) for ISS III (P = 0.09). According to Tokuhashi survival score, 21 patients (41.2%) will survive <6 months, 6 (11.8%) 6 to 12 months, and 24 (47%) >12 months. According to Tomita et al., 50 patients (98%) will survive >49.9 months and 1 patient (2%) <15 months. Regardless of the ISS grade prognosis, Tokuhashi survival score, and to a lesser extent Tomita score, underestimated the actual survival very significantly [P < 0.0001, Log Rank (Mantel-Cox)].

Conclusion: We suggest that spine surgical prognosis scores are not accurate and are not able to predict the survival of patients with spine myeloma metastases. Spine surgeons have to be guided not by the initial ISS stage but rather by spinal instability and neurological status.

Level Of Evidence: N/A.
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March 2017

Symptomatic vertebral hemangiomas during pregnancy.

J Neurosurg Spine 2014 May 7;20(5):585-91. Epub 2014 Mar 7.

Department of Neurosurgery and Neurotraumatology.

Symptomatic vertebral hemangiomas during pregnancy are rare, as only 27 cases have been reported in the literature since 1948. However, symptomatic vertebral hemangiomas can be responsible for spinal cord compression, in which case they constitute a medical emergency, which raises management difficulties in the context of pregnancy. Pregnancy is a known factor responsible for deterioration of these vascular tumors. In this paper, the authors report 2 clinical cases of symptomatic vertebral hemangiomas during pregnancy, including 1 case of spontaneous fracture that has never been previously reported in the literature. The authors then present a brief review of the literature to discuss emergency management of this condition. The first case was a 28-year-old woman at 35 weeks of gestation, who presented with paraparesis. Spinal cord MRI demonstrated a vertebral hemangioma invading the body and posterior arch of T-3 with posterior epidural extension. Laminectomy and vertebroplasty were performed after cesarean section, allowing neurological recovery. The second case involved a 35-year-old woman who presented with spontaneous fracture of T-7 at 36 weeks of gestation, revealing a vertebral hemangioma with no neurological deficit, but it was responsible for pain and local instability. Treatment consisted of postpartum posterior interbody fusion. With a clinical and radiological follow-up of 2 years, no complications and no modification of the hemangiomas were observed. A review of the literature reveals discordant management of these rare cases, which is why the treatment course must be decided by a multidisciplinary team as a function of fetal gestational age and maternal neurological features.
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May 2014

Successful treatment of pudendal neuralgia with tricolumn spinal cord stimulation: case report.

Neurosurgery 2012 Sep;71(3):E757-62; discussion E763

Department of Neurosurgery, Poitiers University School of Medicine, Poitiers, France.

Background And Importance: There is large variation in the success of decompressive surgery for pudendal neuralgia (PN), the most chronic, disabling form of perineal pain. We attempt to determine whether spinal cord stimulation using new-generation multicolumn leads could form part of the treatment algorithm for refractory PN.

Clinical Presentation: A man with PN that was unresponsive to conventional treatment demonstrated a neuropathic component and had a negative response to nerve infiltrations (so he was not indicated for decompressive surgery) and a positive response to perianal transcutaneous electrical nerve stimulation and was implanted with a 16-contact surgical lead at the level of conus medullaris, allowing multicolumn stimulation. Using transverse combinations, it was possible to obtain 100% paresthesia over the perineal area without unwanted dorsal root stimulation. Perineal and radicular pain was successfully relieved for up to 12 months (80% and 60% reduction in the visual analogue scale scores, respectively), with an improvement in all quality of life domains and a reduction in drug consumption.

Conclusion: Spinal cord stimulation using a 16-contact lead may be a viable therapeutic option for patients with refractory PN for whom decompressive surgery is contraindicated.
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September 2012