Bone Flap Resorption After Cranioplasty: Risk Factors and Proposal of the Flap Integrity Score

BACKGROUND

Bone flap resorption is a known complication of postdecompressive autologous cranioplasty. Although several potential etiopathogenetic factors have been investigated, their role is still under discussion. To further complicate things, resorption is not an all-or-nothing event, patients frequently presenting with different degrees of flap remodeling. Focus of this paper was to describe the elaboration of a score quantifying bone resorption according to a set of clinical and radiological criteria, hopefully allowing prompt identification of patients needing resurgery before the development of adverse events.

METHODS

In a 10-year period, 281 autologous cranioplasties were performed at our institution following decompressive craniectomy. Pertinent clinical and radiological information was registered. A set of 3 clinical and 3 radiological parameters was established to score the degree of resorption, identified under the acronym FIS (Flap Integrity Score). Three groups of patients emerged, respectively showing no (208), partial (32), and advanced (41) resorption.

RESULTS

An overall 14.6% incidence of advanced bone resorption was found in our series. Younger age, bone multifragmentation, higher postcranioplasty Glasgow Outcome Scale scores, <2 cm distance of medial craniectomy border from the midline, and cause leading to decompressive craniectomy were associated to a statistically significant higher risk of developing a relevant bone flap resorption. The first three variables were confirmed as risk factors in multivariate analysis. Flap Integrity Score well discriminated the 3 different groups.

CONCLUSIONS

Autologous bone repositioning is still a valuable, low-cost, cosmetically and functionally satisfactory procedure. Nonetheless, although resorption affects a minor percentage of patients, its early identification and treatment can improve long-term results.

Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

BACKGROUND

Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres.

METHODS

This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low-middle-income countries.

RESULTS

In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of 'single-use' consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low-middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia.

CONCLUSION

This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high- and low-middle-income countries.

Managing ventriculoperitoneal shunt exposure in adult patients: surgical options and implant removal prevention

BACKGROUND

Ventriculoperitoneal shunt exposure is rare. Small series reporting on managing this complication mainly focus on the pediatric population, where wound breaks over cerebrospinal fluid (CSF) chambers are observed most frequently. However, case series on adult patients are missing.

METHODS

Between June 2004 and December 2019, 18 patients underwent ventriculoperitoneal shunt revision due to implant exposure. Pertinent data were retrospectively collected from the hospital database. Their full clinical history, laboratory values, neuroradiological imaging, pre-treatment CSF characteristics, photographic and video material, and surgery types were reviewed.

RESULTS

The ventricular catheter was exposed in eight patients (the frontal region in six and the occipital region in two), the valve chamber at the retroauricular region in six, the shunt tube in seven (at the neck in four, the supraclavicular region in two, and the abdominal incision in one). Multiple exposure sites were found in two cases. Two patients with CSF infections benefitted from system removal and temporary external ventricular drainage until infection control was achieved. The remaining 16 patients underwent on-ward revision (wound curettage, skin mobilisation, and re-suture over the exposed part of the shunt), which was effective in 14 patients, but further revision was required in two patients.

CONCLUSIONS

While rare, ventriculoperitoneal shunt exposure is a serious complication. In our experience, a prompt and accurate on-ward revision could save the implant in most patients without CSF infections.

A novel, reusable, realistic neurosurgical training simulator for cerebrovascular bypass surgery: Iatrotek® bypass simulator validation study and literature review

Background

Microanastomosis is a challenging technique requiring continuous training to be mastered. Several models have been proposed, but few effectively reflect a real bypass surgery; even fewer are reusable, most are not easily accessible, and the setting is often quite long. We aim to validate a simplified, ready-to-use, reusable, ergonomic bypass simulator.

Methods

Twelve novice and two expert neurosurgeons completed eight End-to-End (EE), eight End-to-Side (ES), and eight Side-to-Side (SS) microanastomoses using 2-mm synthetic vessels. Data on time to perform bypass (TPB), number of sutures and time required to stop potential leaks were collected. After the last training, participants completed a Likert Like Survey for bypass simulator evaluation. Each participant was assessed using the Northwestern Objective Microanastomosis Assessment Tool (NOMAT).

Results

When comparing the first and last attempts, an improvement of the mean TPB was registered in both groups for the three types of microanastomosis. The improvement was always statistically significant in the novice group, while in the expert group, it was only significant for ES bypass. The NOMAT score improved in both groups, displaying statistical significance in the novices for EE bypass. The mean number of leakages, and the relative time for their resolution, also tended to progressively reduce in both groups by increasing the attempts. The Likert score expressed by the experts was slightly higher (25 vs. 24.58 by the novices).

Conclusions

Our proposed bypass training model may represent a simplified, ready-to-use, reusable, ergonomic, and efficient system to improve eye-hand coordination and dexterity in performing microanastomoses.

Vascular Lesions of the Pineal Region: A Comprehensive Review of the Therapeutic Options

OBJECTIVE

Vascular lesions of the pineal region comprise aneurysms of the pineal region, arteriovenous malformations, cavernous malformations, and vein of Galen malformations. In the present report, we have offered an extensive review of each vascular pineal region lesion.

METHODS

We performed an extensive literature review, focusing on the current therapeutic options available for the different vascular lesions of the pineal region.

RESULTS

Vascular lesions of the pineal region are rare. Microneurosurgery remains a valid treatment of cavernomas, arteriovenous malformations, and aneurysms. Endovascular treatments seem to be the first option for the vein of Galen malformations, followed by microneurosurgery. Radiosurgery seems beneficial for small-size arteriovenous malformations. Complex and large vascular lesions will require a combination of multiple treatments.

CONCLUSIONS

Vascular lesions of the pineal region are complex, uncommon diseases. Thus, definitive therapeutic modalities for these lesions require further research.

Management of infected hydroxyapatite cranioplasty: Is salvage feasible?

Introduction

The use of hydroxyapatite cranioplasties has grown progressively over the past few decades. The peculiar biological properties of this material make it particularly suitable for patients with decompressive craniectomy where bone reintegration is a primary objective. However, hydroxyapatite infection rates are similar to those of other reconstructive materials.

Research question

We investigated if infected hydroxyapatite implants could be saved or not.

Materials and methods

We present a consecutive series over a 10-year period of nine patients treated for hydroxyapatite cranioplasty infection. Clinical and radiological data from admission and follow-up, photo and video material documenting the different phases of infection assessment and treatment, and final outcomes were retrospectively reviewed in an attempt to identify the best options and possible pitfalls in a case-by-case decision-making process.

Results

Five unilateral and four bifrontal implants became infected. Wound rupture with cranioplasty exposure was the most common presentation. At revision, all implants were ossified, requiring a new craniotomy to clean the purulent epidural collections. The cranioplasty was fully saved in one hemispheric and 2 bifrontal implants and partially saved in the remaining 2 bifrontal implants. A complete cranioplasty removal was needed in the other 4 cases, but immediate cranial reconstruction was possible in 2. Skin defects were covered by free flaps in 3 cases. Four patients underwent adjunctive hyperbaric therapy, which was effective in one case.

Discussion and conclusion

In our experience, infected hydroxyapatite cranioplasty management is complex and requires a multidisciplinary approach. Salvage of a hydroxyapatite implant is possible under specific circumstances.

•

We present a series of 9 patients treated for hydroxyapatite cranioplasty infection.

•

One hemispheric and 2 bifrontal implants were fully saved, 2 bifrontal only partially.

•

A complete removal was needed in 4 cases, but immediate cranial reconstruction was possible in 2.

•

Infected hydroxyapatite cranioplasties salvage is complex, but possible under specific circumstances.

Ventriculoatrial Shunting: An Escape Option in Patients with Idiopathic Normal Pressure Hydrocephalus Failing Ventriculoperitoneal Drainage

BACKGROUND

Ventriculoperitoneal (VP) shunting is widely accepted as the gold-standard treatment for idiopathic normal pressure hydrocephalus (iNPH). However, a restricted group of patients experience only minimal or no improvement after the operation. In such cases, the question whether the diagnosis was incorrect or the shunt is malfunctioning remains unanswered.

METHODS

We retrospectively collected data on a 10-year series of VP-shunted patients with iNPH showing transient or minimal improvement of symptoms within 3 weeks from surgery. A full workup (including noninvasive diagnostic, cognitive, and invasive tests) was performed. After ruling out mechanical malfunction, we performed a tap test followed by a Katzman test 2 weeks later. The confirmed persistence of disturbance of cerebrospinal fluid dynamics was treated by shunt revision and, if found working, by its replacement into the atrial cavity.

RESULTS

Twenty patients were diagnosed with shunt insufficiency. At surgery, the distal end of the shunt was easily extruded and found working in all cases. It was then repositioned into the right atrium (the first 8 patients of the series also underwent failed contralateral abdominal replacement). Early postoperative clinical improvement was always confirmed. In 1 case, shunt overdrainage was corrected by valve upregulation.

CONCLUSIONS

According to our experience, inadequate distal end placement of a shunt might be one of the reasons needing investigation in patients with iNPH failing improvement after surgery. In such situations, the conversion to a ventriculoatrial shunt proved to be a low-cost and successful treatment option.

Characterization and Ex Vivo Application of Indocyanine Green Chitosan Patches in Dura Mater Laser Bonding

Dura mater repair represents a final and crucial step in neurosurgery: an inadequate dural reconstruction determines dreadful consequences that significantly increase morbidity and mortality rates. Different dural substitutes have been used with suboptimal results. To overcome this issue, in previous studies, we proposed a laser-based approach to the bonding of porcine dura mater, evidencing the feasibility of the laser-assisted procedure. In this work, we present the optimization of this approach in ex vivo experiments performed on porcine dura mater. An 810-nm continuous-wave AlGaAs (Aluminium Gallium Arsenide) diode laser was used for welding Indocyanine Green-loaded patches (ICG patches) to the dura. The ICG-loaded patches were fabricated using chitosan, a resistant, pliable and stable in the physiological environment biopolymer; moreover, their absorption peak was very close to the laser emission wavelength. Histology, thermal imaging and leak pressure tests were used to evaluate the bonding effect. We demonstrated that the application of 3 watts (W), pulsed mode (T_on 30 ms, T_off 3.5 ms) laser light induces optimal welding of the ICG patch to the dura mater, ensuring an average fluid leakage pressure of 216 ± 105 mmHg, falling within the range of physiological parameters. This study demonstrated that the thermal effect is limited and spatially confined and that the laser bonding procedure can be used to close the dura mater. Our results showed the effectiveness of this approach and encourage further experiments in in vivo models.

Application of a Scanner-Assisted Carbon Dioxide Laser System for Neurosurgery

BACKGROUND

Despite potential advantages, broad carbon dioxide (CO₂) laser diffusion in neurosurgery was historically prevented by several operative limitations. Nonetheless, in recent decades, significant improvements, in particular the development of surgical scanners, have made CO₂ laser surgery easier and reproducible. The aim of this study was to report our preliminary experience with the SmartXide² CO₂ laser system.

METHODS

The SmartXide² laser system is a CO₂ laser with a radiofrequency-excited laser source, a surgical scanner, and a high-precision micromanipulator, which are connected to the surgical microscope. Ten different brain and spinal tumors were treated to evaluate the laser system potential in different neurosurgical scenarios. Four illustrative cases were presented.

RESULTS

The CO₂ laser was used together with the traditional instruments in every step of the procedures, from the initial pial incision (intra-axial tumors) or early debulking (extra-axial lesions), to progressive tumor removal, and, lastly, for surgical cavity hemostasis. No injury to the surrounding neurovascular structures was observed. Postoperative neuroimaging confirmed complete tumor removal and showed a marked reduction of preoperative surrounding edema without signs of cerebral/medullary contusions.

CONCLUSIONS

In selected cases, the SmartXide² CO₂ laser system could be a helpful, reliable, and safe surgical instrument to treat different cerebral and spinal lesions. It addresses some of the limitations of laser systems and is able to cut/ablate and coagulate the tissue simultaneously, with minimal lateral thermal spread, preserving the surrounding eloquent neurovascular structures. Moreover, having no consumable accessories, it is also cost-effective.

Management of Obstructive Hydrocephalus Associated with Pineal Region Cysts and Tumors and Its Implication in Long-Term Outcome

BACKGROUND

Different treatment options have been proposed for obstructive hydrocephalus associated with pineal lesions. We discuss the obstructive hydrocephalus management associated with pineal region tumors and cysts in Helsinki Neurosurgery.

METHODS

In this article, hydrocephalus treatment by tumor-cyst removal (n = 40), shunt surgery (n = 25), and endoscopic ventriculostomies (n = 3) is evaluated in 68 patients with obstructive hydrocephalus among 136 patients with pineal region tumor and cyst. Multivariate statistical analysis was followed by univariate and multivariate regression models of last functional status, last tumor-free imaging, and disease-specific mortality of the study population.

RESULTS

Preoperative hydrocephalus was linked to higher World Health Organization tumor grades, poor functional status, higher mortality, and incomplete resection of pineal region cysts and tumors. Preoperative hydrocephalus remained a predictor of poor last functional status after multivariate regression. Pineal lesion removal with the posterior third ventricle opening as primary hydrocephalus treatment resulted in better last functional status, fewer postoperative shunts, fewer hydrocephalus-related procedures, and fewer postoperative infections than in the shunt-treatment group. Multivariate regression analysis linked higher World Health Organization tumor grade, poor immediate functional status, postoperative complications, and incomplete surgical resection as independent predictors of disease mortality in patients with hydrocephalus. Same variables (except immediate modified Rankin Scale score) and higher number of shunt surgeries became independent predictors of poor last functional status at multivariate analysis. Incomplete resection was the only independent predictor of tumor-free magnetic resonance imaging at the last evaluation.

CONCLUSIONS

Direct removal of pineal lesions with the opening of the posterior third ventricle could represent effective and reliable management of the associated obstructive hydrocephalus. Further research is required to generalize our inferences.

Foreign body granuloma reaction after endovascular therapy of an unruptured right frontal arteriovenous malformation

Foreign body reactions after endovascular procedures for brain arteriovenous malformations are extremely rare. We report the case of a cerebral foreign body granuloma reaction after embolization of a frontal arteriovenous malformation with Onyx. A previously treated 36-year-old man underwent re-embolization of a residual and recurrent unruptured right frontal vascular malformation with Onyx. The post-procedural imaging revealed a right frontotemporal heterogeneously enhancing expansive lesion associated with a residual malformation. Following microsurgical resection, the histopathological examination of the expansive lesion revealed basophilic foreign body like deposits adjacent to multi-nucleated giant cells, highly compatible with cerebral foreign body granulomas reaction to Onyx. The clinical and radiological follow-up of the patient was favorable after complete resection of the lesions.

Functional status of surgically treated pineal cyst patients

Background:

Microsurgical removal represents a well-accepted treatment option for symptomatic benign pineal cysts (PCs). However, very few studies have quantitatively evaluated the functional status of surgically treated PC patients.

Methods:

A detailed analysis of preoperative, immediate postoperative, and long-term clinical and radiological characteristics was performed. The functional status of the patients was categorized using the modified Rankin scale (mRS) and the Chicago Chiari Outcome Scale (CCOS). In addition, a comparative analysis between pediatric and adult patients with PCs was carried out.

Results:

Overall, pediatric patients experienced better long-term mRS scores than adults. The differences between the pre-, the immediate post-, and the last postoperative mRS of the patients were statistically significant for the total population (P < 0.001). All patients obtained a CCOS of 11 or more, which reflects a good/optimal result after microneurosurgery. The type of the surgical approach was independently associated with the postoperative complications (P < 0.01), more frequently reported with the midline supracerebellar infratentorial (SCIT) approach than with its paramedian modification.

Conclusion:

The functional status of properly selected symptomatic patients with PCs may improve significantly after their surgical management through a paramedian SCIT approach in sitting position.

Timing of cranial reconstruction after cranioplasty infections: are we ready for a re-thinking? A comparative analysis of delayed versus immediate cranioplasty after debridement in a series of 48 patients

The optimal management of cranioplasty infections remains a matter of debate. Most authors have suggested that the infected bone/implant removal is mandatory, combined with prolonged antibiotic therapy before reconstruction. However, failures can occur, even with 12-18-month intervals between the surgeries. Longer wait times before cranial reconstruction increase the risks of socioeconomic burdens and further complications, as observed in decompressed patients hosting shunts. In our department, we treated 48 cranioplasty infections over a period of 8 years, divided into two groups. For Group A (n = 26), the treatment consisted of cranioplasty removal and debridement, followed by a delayed reconstruction. Group B (n = 22) received 2 weeks of broad-spectrum antibiotics, followed by an "aggressive" field debridement and immediate cranioplasty. All patients received a minimum of 8 weeks of post-operative antibiotic therapy and were scheduled for clinic-radiological follow-ups for at least 36 months. Significant differences were observed between Groups A and B with respect to the number of failures (respectively 7 versus 1), the global operative time (significantly longer for Group B), germ identification (respectively 7 versus 13), and the overall length of hospital stay (on average, 61.04 days in Group A versus 47.41 days in Group B). Three shunted patients in Group A developed sinking flap syndrome. Shunt resetting allowed symptom control until cranioplasty in one subject, whereas two did not improve, even after reconstruction. In selected patients, an aggressive field debridement, followed by the immediate replacement of an infected cranioplasty, may represent a safe and valuable option.

The relationship between preoperative predictive factors for clinical outcome in patients operated for lumbar spinal stenosis by decompressive laminectomy

Background:

Our hypothesis was that by identifying certain preoperative predictive factors, we could favorably impact clinical outcomes in patients undergoing decompressive surgery for lumbar spinal stenosis (LSS).

Methods:

In this retrospective study, there were 65 patients (2016–2018) with symptomatic LSS who underwent decompressive laminectomy without fusion. Their clinical outcomes were assessed utilizing the Oswestry Disability Index (ODI). Multiple preoperative variables were studied to determine which ones would help predict improved outcomes: gender, age, body mass index (BMI), general/neurological examination, smoking, and drug therapies (anxiolytics and/or antidepressants).

Results:

All patients demonstrated statistically significant improvement on the ODI. Multivariate analysis revealed that those with higher preoperative BMI had significantly lower ODI on 1-year follow-up examinations, reflecting poorer outcomes. Postoperatively, 44 patients (67%) exhibited lower utilization of anxiolytic medications, 52 patients (80%) showed reduced use of antidepressant drugs, and pain medications utilization was reduced in 33 patients (50%).

Conclusion:

Decompressive laminectomy without fusion effectively managed LSS. It reduced patients’ use of pain, anxiety, and antidepressant medications. In addition, we found that increased preoperative BMIs contributed to poorer postoperative outcomes (e.g., ODI values).

Repair of ventricular wall by pericranial flap: a valuable option?

Ventricular walls penetration frequently occurs in periventricular gliomas surgery. Even when aimed at maximal tumor resection, it can lead to several complications, including CSF leak, delayed wound healing and, potentially, distant tumor dissemination, with a negative impact on overall survival. Several authors have claimed damaged ventricular walls always need repair, especially when the additional use of intrathecal chemotherapy is scheduled. Fibrin sponge has been consistently used in the past to address small ventricular walls defects but more recently attention has been focused on TachoSilTM, that seems to be a valid alternative to close up to 1.5 cm gaps. After an accurate review of literature, we were unable to find any report describing the use of autologous pericranium to the same aim. We report the case of a 54 years-old patient who presented with symptoms of intracranial hypotension four weeks after his last surgery (performed at another Institution) for a relapsing right frontal grade III astrocytoma,. Pre-operative MRI showed a huge gap in the roof of the right frontal ventricular horn, associated to a large subdural hygroma and a massive subcutaneous CSF collection. The gap was repaired using a layer of autologous pericranium, sutured by pial stitches to the surrounding brain and reinforced by fibrin glue. Full and permanent leak sealing was obtained within the next 2 weeks, but patient immediately and fully recovered from his symptoms. Although limited by the single case experience, we believe that pericranium might be considered as an alternative to artificial materials in cases of large ventricular walls openings, being easily intraoperatively retrievable, granting maximal biocompatibility, not significantly impacting on surgery duration and overall costs.

Systematic review of pineal cysts surgery in pediatric patients

INTRODUCTION

We present a consecutive case series and a systematic review of surgically treated pediatric PCs. We hypothesized that the symptomatic PC is a progressive disease with hydrocephalus at its last stage. We also propose that PC microsurgery is associated with better postoperative outcomes compared to other treatments.

METHODS

The systematic review was conducted in PubMed and Scopus. No clinical study on pediatric PC patients was available. We performed a comprehensive evaluation of the available individual patient data of 43 (22 case reports and 21 observational series) articles.

RESULTS

The review included 109 patients (72% females). Ten-year-old or younger patients harbored smaller PC sizes compared to older patients (p < 0.01). The pediatric PCs operated on appeared to represent a progressive disease, which started with unspecific symptoms with a mean cyst diameter of 14.5 mm, and progressed to visual impairment with a mean cyst diameter of 17.8 mm, and hydrocephalus with a mean cyst diameter of 23.5 mm in the final stages of disease (p < 0.001). Additionally, 96% of patients saw an improvement in their symptoms or became asymptomatic after surgery. PC microsurgery linked with superior gross total resection compared to endoscopic and stereotactic procedures (p < 0.001).

CONCLUSIONS

Surgically treated pediatric PCs appear to behave as a progressive disease, which starts with cyst diameters of approximately 15 mm and develops with acute or progressive hydrocephalus at the final stage. PC microneurosurgery appears to be associated with a more complete surgical resection compared to other procedures.

Cervical lordosis after subaxial spinal trauma surgery: relationship with neck pain and stiffness

BACKGROUND

The objective of this retrospective study is to evaluate how neck pain is influenced by post-operative cervical alignment in patients operated for cervical spinal trauma.

PATIENTS AND METHODS

From January 2013 to June 2017, at our department we operated 34 patients with cervical spinal trauma, 22 males and 12 females. Age, sex, level and type of fractures, surgical approach, fixation levels (cervical or cervico-dorsal), preoperative and postoperative CT scan, cervical (C2-C7) Cobb angle (lordotic > +10°, straight 0 /+10°, kyphotic < 0°) at X-rays on sitting position 3 months after surgery, postoperative self-reported neck stiffness scale, preoperative and follow-up ASIA score, pre and postoperative VAS value were evaluated for each patient. Statistical analysis was performed according to the Mann-Whitney and T-test.

RESULTS

In this series, 22 patients were operated by anterior approach, 7 patients by posterior approach and 5 by combined approach. Postoperative chronic cervical pain was not correlated with cervical sagittal alignment after surgery, fracture type, surgical approach, fixation level and postoperative ASIA score but is correlated with the presence of neck stiffness (P=0,001). Patients treated with posterior approach (P=0,022) and fracture type C (P=0,026) had higher significantly neck stiffness compared to patients who underwent anterior approach for type B fractures.

CONCLUSIONS

The presence of abnormal cervical lordosis after surgery for cervical spinal trauma does not correlate with neck pain. Patients treated with posterior fixation had higher neck stiffness and related chronic pain.

Extent of Resection and Long-Term Survival of Pineal Region Tumors in Helsinki Neurosurgery

BACKGROUND

Pineal region tumors represent challenging surgical lesions with wide ranges of survival reported in different surgical series. In this article, we emphasize the role of complete microsurgical resection (CMR) to obtain a favorable long-term outcome of pineal region tumors.

METHODS

We report a retrospective study of pineal region tumors operated on in Helsinki Neurosurgery between 1997 and 2015. Information was obtained from the hospital records, and an evaluation of the Finnish population register was conducted in July 2018 to determine the current status of the patients.

RESULTS

A total of 76 pineal region tumors were operated on. The survival was 62% at a mean follow-up of 125 ± 105 months (range, 0-588 months), and the disease-related mortality was limited to 14 patients (18.4%). Up to July 2018, 29 patients had died. Two patients died 1 and 3 months after surgery of delayed thalamic infarctions, 12 patients of disease progression, and 15 had non-disease-related deaths. Only 1 patient was lost in the long-term follow-up. Ten of 14 disease-related deaths occurred during the first 5 years of follow-up: 5 diffuse gliomas, 3 germ cell tumors, 1 grade II-III pineal parenchymal tumor of intermediate differentiation, and 1 meningioma. CMR was linked to better tumor-free survival and long-term survival, with the exception of diffuse gliomas.

CONCLUSIONS

CMR, in the setting of a multidisciplinary management of pineal region tumors, correlates with favorable survival and with minimal mortality. Surgically treated grade II-IV gliomas constitute a particular group with high mortality within the first 5 years independently of the microsurgical resection.

The microsurgical management of benign pineal cysts: Helsinki experience in 60 cases

Background:

Microsurgical resection represents a well-accepted management option for symptomatic benign pineal cysts. Symptoms such as a headache, hydrocephalus, and visual deficiency are typically associated with pineal cysts. However, more recent studies reported over the past years have characterized additional symptoms as a part of the clinical manifestation of this disease and represent additional indications for intervention.

Methods:

We present a retrospective review of patients with histologically confirmed benign pineal cysts that were operated on in our department between 1997 and 2015. A demographic analysis, evaluation of preoperative status, surgical treatment, as well as immediate and long-term clinical and radiological outcomes were conducted.

Results:

A total of 60 patients with benign pineal cysts underwent surgery between 1997 and 2015. Gross total resection was achieved in 58 cases. All patients except one improved in their clinical status or had made a full recovery at the time of the last follow-up. The key steps for surgical resection of pineal cysts are reported, based on an analysis of representative surgical videos.

Conclusions:

We describe in this paper one of the largest series of microsurgically treated pineal cysts. In our opinion, judicious microsurgery remains the most suitable technique to effectively deal with this disease.

Endoscope-assisted microsurgical evacuation versus external ventricular drainage for the treatment of cast intraventricular hemorrhage: results of a comparative series

Cast intraventricular hemorrhage (IVH) is associated to high morbidity/mortality rates. External ventricular drainage (EVD), the most common treatment adopted in these patients, may be unsuccessful due to short-term drain obstruction and requires weeks for cerebrospinal fluid (CSF) clearing, increasing the risks of ventriculits. Administration of intraventricular fibrinolytic agents and endoscopic evacuation have been proposed as alternative treatments, but with equally poor results. We present a retrospective analysis of two groups of patients who respectively underwent endoscope-assisted microsurgical evacuation versus EVD for the treatment of cast IVH. In a 10-year time, 25 patients with cast IVH underwent microsurgical, endoscope-assisted evacuation. Twenty-seven were instead treated by EVD. The two groups were compared in terms of hematoma evacuation, CSF clearing time, infection rates, need for permanent shunting, short/long-term survival, and functional outcome. In endoscope-assisted surgeries, full CSF clearance required 14 ± 3 days in 20 patients and 21 ± 3 days in 5; in the EVD group, 21 ± 3 days were needed in 12 patients, 28 ± 3 days in 11, and 35 ± 3 days in 4. Permanent shunting was inserted respectively in 19 endoscopic and 23 EVD patients. Final mRs score was 0-3 in 13 endoscopic cases, 4-5 in the remaining 12. In the EVD group, 7 subjects scored mRs 0-3, 16 scored 4-5; 4 died. In our experience, endoscope-assisted evacuation of cast IVH reduced ICU staying and CSF clearance times. It also seemed to improve neurological outcome, but without affecting the need for permanent shunt. On the counterside, it increases the number of severely disabled survivors.

Pineal Parenchymal Tumors of Intermediate Differentiation: A long-Term Follow-Up Study in Helsinki Neurosurgery

BACKGROUND

Pineal parenchymal tumors of intermediate differentiation (PPTIDs) are rare lesions with particular features compared with other pineal parenchymal tumors.

METHODS

We present a retrospective review of patients with histologically confirmed PPTIDs who were operated on in our department between 1997 and 2015. A demographic analysis and an evaluation of preoperative status, surgical treatment, as well as immediate and long-term clinical and radiologic outcomes were conducted.

RESULTS

Fifteen patients with PPTIDs were operated on between 1997 and 2015. Gross total removal was achieved in 11 cases; 2 patients underwent near-total resection, 1 partial resection, and 1 received brachytherapy after an endoscopic biopsy. Nine patients required external radiation therapy (4 due to a pleomorphic histology of their lesion including pineoblastoma features in 3 of them; 3 after a subtotal resection; and 2 for tumor recurrence). No patient received chemotherapy. The survival rate of our patients was 57.1% at a mean follow-up of 137.2 ± 77.6 months (39-248 months).

CONCLUSIONS

A proper multidisciplinary management of PPTIDs based on a gross total removal of the lesion, and an adjuvant radiotherapy in selected cases, may improve the overall survival of these aggressive tumors.

Cord Splitting Access to Ventral Intradural Cysts of Cervicothoracic Junction and Thoracic Spine

OBJECTIVE

Surgical treatment of ventrally located intradural cysts is difficult and controversial. Laminectomy with division of the denticulate ligaments and gentle cord mobilization remains the standard approach but risks further neurologic deterioration secondary to cord manipulation. Our purpose is to evaluate the safety and effectiveness of a midline cord-splitting approach as an alternative for treating ventral thoracic intradural cysts.

METHODS

We describe 2 patients who were treated for ventral intradural cysts causing progressive and severe myelopathy. Under general anesthesia and continuous neurophysiologic monitoring, laminectomy, durotomy, and cord splitting through a midline approach gave direct access to both lesions. Cyst drainage was supplemented by a cystopleural shunt in 1 case.

RESULTS

Cyst collapse and cord reexpansion were documented in both patients with a magnetic resonance imaging scan 1 week after surgery. In both cases there was a significant neurologic improvement, which was maintained 2 years postoperatively. Intraoperative monitoring recorded no loss of somatosensory or motor potentials during surgery. Follow-up magnetic resonance imaging scans 2 years postoperatively showed no evidence of cyst recurrence, and both patients remained neurologically improved and stable.

CONCLUSIONS

We have been able to drain 2 ventral intradural cysts using a cord-splitting technique. This has allowed safe access to purely ventrally located lesions, which were inaccessible dorsally or dorsolaterally. By using this method we have been able to avoid a more invasive ventral transthoracic approach necessitating vertebrectomy and reconstruction and risking serious complications.

On-ward surgical management of wound dehiscence: report of a single neurosurgical center experience and comparison of safety and effectiveness with conventional treatment

The early identification and optimized treatment of wound dehiscence are a complex issue, with implications on the patient's clinical and psychological postoperative recovery and on healthcare system costs. The most widely accepted treatment is surgical debridement (also called "wash out"), performed in theater under general anesthesia (GA), followed by either wide-spectrum or targeted antibiotic therapy. Although usually effective, in some cases, such a strategy may be insufficient (generally ill, aged, or immunocompromised patients; poor tissue conditions). Moreover, open revision may still fail, requiring further surgery and, therefore, increasing patients' discomfort. Our objective was to compare the effectiveness, costs, and patients' satisfaction of conventional surgical revision with those of bedside wound dehiscence repair. In 8 years' time, we performed wound debridement in 130 patients. Two groups of patients were identified. Group A (66 subjects) underwent conventional revision under GA in theater; group B (64 cases) was treated under local anesthesia in a protected environment on the ward given their absolute refusal to receive further surgery under GA. Several variables-including length and costs of hospital stay, antibiotic treatment modalities, and success and resurgery rates-were compared. Permanent wound healing was observed within 2 weeks in 59 and 55 patients in groups A and B, respectively. Significantly reduced costs, shorter antibiotic courses, and similar success rates and satisfaction levels were observed in group B compared with group A. In our experience, the bedside treatment of wound dehiscence proved to be safe, effective, and well-tolerated.

Venous air embolisms and sitting position in Helsinki pineal region surgery

Background

Nowadays, the sitting position has lost favor among neurosurgeons partly due to assumptions of increased complications, such as venous air embolisms (VAEs) and hemodynamic disturbances. The aim of our study is to describe the importance of some anesthetic considerations and the utility of antigravity trousers as well, together with a skillful neurosurgery and an imperative proper teamwork, in order to prevent the risk of severe VAE during pineal region surgery. We routinely use them for the variant of the sitting position we developed, the "praying position."

Methods

A retrospective review of 51 pineal lesions operated on in the "praying position" using antigravity trousers was carried out. In the "praying position" the legs of the patient are kept parallel to the floor. Hence, antigravity trousers are used to generate an adequate cardiac preload.

Results

VAE associated to persistent hemodinamic changes was nonexistent in our series. The rate of VAE was 35.3%. VAEs were diagnosed mainly by monitoring of the end-tidal CO₂ (83.33%). A venous system lesion was the cause in most of the cases. When VAE was suspected, an inmediate reaction based on a good teamwork was imperative. No cervical spine cord injury nor peripheral nerve damage were reported. The average microsurgical time was 48 ± 33 min.

Conclusions

The risks of severe VAE during pineal region surgery in the "praying-sitting position" may be effectively prevented by some essential anesthetic considerations and the use of antigravity trousers together with a skillful neurosurgery, and an imperative proper teamwork.

Modified Pure Endoscopic Approach to Pineal Region: Proof of Concept of Efficient and Inexpensive Surgical Model Based on Laboratory Dissections

OBJECTIVE

In recent decades endoscopic techniques have been increasingly used in neurosurgery as they may offer a valuable close-up view of the working area through a minimally invasive surgical corridor. Herein, we present an inexpensive and efficient endoscopic surgical model using a borescope, which was used for a "modified pure endoscopic approach" to the pineal region.

METHODS

A borescope video camera was connected to a 16-inch personal computer monitor. A standard midline suboccipital craniotomy was performed on 2 cadaveric heads in the Concorde position. Then, a "borescopic" supracerebellar infratentorial approach was executed, thus reaching the pineal region, which was exposed through an extensive arachnoid dissection.

RESULTS

Using the previously described model, we were able to provide excellent exposure of the main neurovascular structures of the pineal region, as shown by the intraoperative videos. In 1 specimen we identified an incidental pineal cyst that was meticulously dissected and removed.

CONCLUSIONS

Our proposed "borescopic" surgical model may represent an inexpensive and efficient alternative to conventional endoscopic techniques and could be used for training purposes, as well as even for clinical procedures, after a proper validation, particularly in economically challenging environments.

Quantitative evaluation of different far lateral approaches to the cranio-vertebral junction using the microscope and the endoscope: a cadaveric study using a tumor model

BACKGROUND

Several far lateral approaches have been proposed to deal with cranio-vertebral junction (CVJ) tumors including the basic, transcondylar, and supracondylar far lateral approaches (B-FLA, T-FLA, and S-FLA). However, the indications on when to use one versus the other are not well systematized yet. Our purpose is to evaluate in an experimental cadaveric setting which approach is best suited to remove tumors of different sizes.

METHODS

We implanted at the CVJ, using a transoral approach, tumor models of different sizes (five 1-cm³ and five 3-cm³ tumors) in ten embalmed cadaveric heads. The artificial tumors were exposed via the three approaches using endoscopic-assisted microneurosurgical technique and neuronavigation. The skull base area exposed and the maneuverability linked to each approach were evaluated using neuronavigation.

RESULTS

In 1-cm³ tumors, the T-FLA and the S-FLA exposed a significantly larger skull base area than the B-FLA both using the microscope and the endoscope (P < 0.05); the T-FLA executed with the microscope provided wider vertical and horizontal maneuverability than the B-FLA (P = 0.030 and 0.017, respectively); the S-FLA executed with the endoscope provided wider vertical maneuverability than the T-FLA (P = 0.031). The S-FLA executed using the microscope and the endoscope provided wider vertical maneuverability than the B-FLA both in 1 and 3-cm³ tumors (P < 0.05).

CONCLUSIONS

In 1-cm³ tumors, the S-FLA and the T-FLA expose a wider skull base area than the B-FLA. In larger tumors, the exposure is similar for all three approaches. Use of the endoscope in an assistive mode may further increase the surgical exposure and maneuverability.

Praying Sitting Position for Pineal Region Surgery: An Efficient Variant of a Classic Position in Neurosurgery

BACKGROUND

The sitting position has lost favor among neurosurgeons partly owing to assumptions of increased complications, such as venous air embolisms and hemodynamic disturbances. Moreover, the surgeon must assume a tiring posture. We describe our protocol for the "praying position" for pineal region surgery; this variant may reduce some of the risks of the sitting position, while providing a more ergonomic surgical position.

METHODS

A retrospective review of 56 pineal lesions operated on using the praying position between January 2008 and October 2015 was performed. The praying position is a steeper sitting position with the upper torso and the head bent forward and downward. The patient's head is tilted about 30° making the tentorium almost horizontal, thus providing a good viewing angle. G-suit trousers or elastic bandages around the lower extremities are always used.

RESULTS

Complete lesion removal was achieved in 52 cases; subtotal removal was achieved in 4. Venous air embolism associated with persistent hemodynamic changes was nonexistent in this series. When venous air embolism was suspected, an immediate reaction based on good teamwork was imperative. No cervical spine cord injury or peripheral nerve damage was reported. The microsurgical time was <45 minutes in most of the cases. Postoperative pneumocephalus was detected in all patients, but no case required surgical treatment.

CONCLUSIONS

A protocolized praying position that includes proper teamwork management may provide a simple, fast, and safe approach for proper placement of the patient for pineal region surgery.

Virtual Reality Glasses and "Eye-Hands Blind Technique" for Microsurgical Training in Neurosurgery

OBJECTIVE

Microsurgical skills and eye-hand coordination need continuous training to be developed and refined. However, well-equipped microsurgical laboratories are not so widespread as their setup is expensive. Herein, we present a novel microsurgical training system that requires a high-resolution personal computer screen, smartphones, and virtual reality glasses.

METHODS

A smartphone placed on a holder at a height of about 15-20 cm from the surgical target field is used as the webcam of the computer. A specific software is used to duplicate the video camera image. The video may be transferred from the computer to another smartphone, which may be connected to virtual reality glasses.

RESULTS

Using the previously described training model, we progressively performed more and more complex microsurgical exercises. It did not take long to set up our system, thus saving time for the training sessions.

CONCLUSION

Our proposed training model may represent an affordable and efficient system to improve eye-hand coordination and dexterity in using not only the operating microscope but also endoscopes and exoscopes.

Skip Hemilaminectomy for Large, Multilevel Spinal Epidural Hematomas: Report of a Series of 11 Patients

OBJECTIVE

We present our experience with a modification of the conventional techniques for the removal of large spinal epidural hematomas (SEHs), based on multilevel "skip hemilaminectomies."

METHODS

Eleven patients with SEHs extending over 5 or more spinal segments were treated at our institution via a modified hemilaminectomy technique from 2008 to 2014. This procedure, that we called "skip hemilaminectomy," consists in performing consecutive, alternating, unilateral laminar decompressions at 2-3 levels, followed by sublaminar undercutting, ipsi- and contralateral flavectomy, plus hematoma removal.

RESULTS

Complete clot evacuation and full neurologic recovery were always achieved. A short hospital stay, fast postoperative mobilization, a minimized need of analgesic drugs, and no complications were recorded.

CONCLUSIONS

In our preliminary experience, skip hemilaminectomy seems to be as safe as more conventional techniques (laminectomy, extended hemilaminectomy) for the removal of large multilevel SEHs, granting full neurologic improvement, short surgical times-even for very large lesions-and no complications at follow-up.

Anatomic Features of Paraclinoid Aneurysms: Computed Tomography Angiography Study of 144 Aneurysms in 136 Consecutive Patients

BACKGROUND

Paraclinoid aneurysms are among the most challenging aneurysms to treat. Computed tomography (CT) angiography helps in evaluating the radiological characteristics of these aneurysms next to bony structures.

OBJECTIVE

To present the CT angiography characteristics of paraclinoid aneurysms in order to better understand such pathology.

METHODS

The study examined CT angiography-based anatomical characteristics obtained retrospectively from 136 patients with 144 paraclinoid aneurysms selected from single-defined catchment populations in Finland. We examined the diameters of the parent artery (internal carotid artery), the location of the aneurysm, its dimensions (width, height, neck), and aneurysm wall irregularity.

RESULTS

We analyzed 144 paraclinoid aneurysms in 136 patients admitted to the hospital during 2000-2014. Multivariable analysis reveals that rupture aneurysms have the following radiological features: aneurysm larger than 5 mm in diameter (P = .006), irregular wall (P = .046), superior location, larger aspect ratio (P = .039), and neck wider than parent artery (P < .001).

CONCLUSION

Smaller diameter of the internal carotid artery and superior location, as well as a large and irregular aneurysm wall, are radiological characteristics of ruptured paraclinoid aneurysms, which CT angiography can measure easily.

Moyamoya Disease in an 8-Year-Old Boy: Direct Bypass Surgery in a Province of Peru

BACKGROUND

Pediatric moyamoya cases may be very arduous, even more so in a developing country, where access to specialized centers may be prevented by different factors.

CASE DESCRIPTION

Herein we report a challenging case, which was managed in the new Neurosurgical Center of Trujillo, regarding the direct anastomosis between the left superficial temporal artery and a cortical branch of the left middle cerebral artery in a 8-year-old Peruvian boy with moyamoya disease. Postoperatively, the patient's motor deficits and aphasia improved. To the best of our knowledge, this is the first performance of a direct revascularization for a pediatric moyamoya case in Peru.

CONCLUSIONS

The creation of highly specialized neurosurgical centers in the main strategic places of developing countries may allow optimal treatment of neurosurgical patients with complex diseases.

The open access video collection project "Hernesniemi's 1001 and more microsurgical videos of Neurosurgery": A legacy for educational purposes

BACKGROUND

Neurosurgical educational programs and courses are helpful to improve the quality of training. Moreover, nowadays, online activities may represent a very useful tool to globally enhance neurosurgical education. The "Hernesniemi's 1001 and more microneurosurgical videos" project aims to show the microsurgical style developed by the senior author and his TEAMs in more than 40 years of experience.

METHODS

More than 1100 high-definition videos of microneurosurgical operations performed by the senior author were carefully edited. These videos illustrate the philosophy of "simple, clean, fast and preserving the normal anatomy" while offering a step by step guide of different neurosurgical procedures.

RESULTS

All the aforementioned material is well organized in an electronic videobook, freely available in Surgical Neurology International. The book also includes comments of great current neurosurgeons and writings of the authors and editors.

CONCLUSION

We are sure that our project will be able to instill in and spread across the neurosurgical community the microneurosurgical style of the senior author, thus representing an efficient educational tool for surgeons all around the world.

Supraorbital subfrontal trans-laminar endoscope-assisted approach for tumors of the posterior third ventricle

BACKGROUND

Different surgical approaches have been developed for dealing with third ventricle lesions, all aimed at obtaining a safe removal minimizing brain manipulation. The supraorbital subfrontal trans-lamina terminalis route, commonly employed only for the anterior third ventricle, could represent, in selected cases with endoscopic assistance, an alternative approach to posterior third ventricular lesions.

METHODS

Seven patients underwent a supraorbital subfrontal trans-laminar endoscope-assisted approach to posterior third ventricle tumors (two craniopharyngiomas, one papillary tumor of the pineal region, one pineocytoma, two neurocytomas, one glioblastoma). Moreover, a conventional third ventriculostomy was performed via the same trans-laminar approach in four cases.

RESULTS

Complete tumor removal was accomplished in four cases, subtotal removal in two cases, and a simple biopsy in one case. Adjuvant radiotherapy and/or chemotherapy was administered, if required, on the basis of the histologic diagnosis. No major complications occurred after surgery except for an intratumoral hemorrhage in a patient undergoing a biopsy for a glioblastoma, which simply delayed the beginning of adjuvant radiochemotherapy. No ventriculoperitoneal shunt placement was needed in these patients at the most recent clinical and radiologic session (average 39.57 months, range 13-85 months). Two illustrative cases are presented.

CONCLUSIONS

The supraorbital subfrontal trans-laminar endoscope-assisted approach may provide, in selected cases, an efficient and safe route for dealing with posterior third ventricular tumors.

Suboccipital osteoblastoma: Microsurgical resection of a rare entity

BACKGROUND

Osteoblastomas are rare lesions comprising 1% of all bone tumors. The occipital bone is one of the rarest affected bone, with only 11 cases reported during the last 40 years.

CASE DESCRIPTION

Here, we describe the clinical presentation and the radiological features of a suboccipital osteoblastoma that was successfully resected in a 30-year-old man. A short video shows the microsurgical removal of the lesion. There was no recurrence during a 12-month follow-up.

CONCLUSIONS

Even if osteoblastomas are benign tumors, a complete removal has to be achieved to reduce the risk of recurrences. This makes necessary an appropriate monitoring of the patient.

Mini-Craniotomy under Local Anesthesia to Treat Acute Subdural Hematoma in Deteriorating Elderly Patients

Background and Study Aims Surgical treatment for acute subdural hematomas (ASDHs) in elderly patients is still considered unsatisfactory. Series focusing on the use of conventional craniotomy or decompressive craniectomy in such patients report discouraging results. Glasgow Coma Scale (GCS) score at admission seems to be crucial in the decision-making process. Deteriorating patients with a GCS score between 9 and 11 are those who would benefit most from the surgical treatment. Unfortunately, elderly patients often present other comorbidities that greatly increase the risk of severe complications after major neurosurgical procedures under general anesthesia. The aim of the present study was to evaluate the feasibility of performing a mini-craniotomy under local anesthesia to treat ASDHs in a select group of elderly patients who were somnolent but still breathing autonomously at admission (GCS 9–11).

Material and Methods Twenty-eight elderly patients (age > 75 years) with ASDH and a GCS score at surgery ranging from 9 to 11 were surgically treated under local anesthesia by a single burr-hole mini-craniotomy (transverse diameter 3–5 cm) and hematoma evacuation. At the end of the procedure, an endoscopic inspection of the surgical cavity was performed to look for residual clots that were not visible under direct vision.

Results The median operation time was 65 minutes. Hematoma evacuation was complete in 22 cases, complete consciousness recovery was observed in all patients but one, and reoperation was required for two patients.

Conclusion Historically, elderly patients with ASDH treated with a traditional craniotomy performed under general anesthesia have not had a good prognosis. Our preliminary experience with this less invasive surgical and anesthesiological approach suggests that somnolent but autonomously breathing elderly patients could benefit from this approach, achieving an adequate hematoma evacuation and bypassing the complications related to intubation and artificial respiratory assistance.

A5 segment aneurysm of the anterior cerebral artery, imbedded into the body of the corpus callosum: A case report

BACKGROUND

The A5 segment aneurysms of the anterior cerebral artery are rare, approximately 0.5% of all intracranial aneurysms. They are small with a wide base located in the midline, with the domes mostly projecting upward or backward.

CASE DESCRIPTION

The authors describe a unique case of A5 segment aneurysm, with the dome embedded into the body of the corpus callosum. This 41-year-old female was admitted to the neurology department for possible multiple sclerosis investigation. Computed tomography angiogram (CTA) revealed a 4-mm right-sided pericallosal artery aneurysm, with rare configuration, which was caudally projected, embedded into the body of the corpus callosum. Considering the family history, patient underwent a prophylactic ligation surgery. The postoperative CT and CTA showed no complication and successful occlusion of the aneurysm with no ischemia or hemorrhage in the corpus callosum.

CONCLUSION

To the best of our knowledge, this is the first case of an aneurysm with this configuration. Our rare case of A5 segment aneurysm demonstrates the importance of planning of the surgery, choosing the appropriate approach, and knowing the detailed anatomy of the region, as well as the necessity of microsurgical clipping of small unruptured AdistAs.

Skin flap complications after decompressive craniectomy and cranioplasty: Proposal of classification and treatment options

BACKGROUND

The list of complications reported after decompressive craniectomy (DC) and cranioplasty is progressively increasing. Nonetheless, the exact incidence of these events is still ill-defined. Problems affecting skin flaps after DC and cranioplasty have never been accurately analyzed in papers and their impact on patients' prognosis is largely underestimated.

METHODS

In a 10-year time, we treated by DC 450 patients, 344 of whom underwent cranioplasty, either with autologous bone or artificial implants (hydroxyapatite, polyetheretherketone, titanium, polymethylmethacrylate). Complications involving skin flaps and requiring re-surgery were observed and treated in 38 cases. We classified three main types of lesions: (1) dehiscence, (2) ulcer, and (3) necrosis. In all cases surgical decision making was performed in cooperation with plastic surgeons, to select the best treatment option.

RESULTS

Dehiscence was reported in 28 cases, ulcer in 6, and necrosis in 4. Surgeries included flap re-opening and re-suturing, Z-plasty, rotational, advancement, or free flaps. Treatment complications required further surgical procedures in six patients.

CONCLUSIONS

In our experience, complications involving skin flaps after DC and post-DC cranioplasty cannot be considered a minor event because of their potential to further compromise the yet fragile conditions of these patients. Their management is complex and requires a multidisciplinary approach to get the better results.

Endoscopic Transnasal Odontoidectomy With Anterior C1 Arch Preservation and Anterior Vertebral Column Reconstruction in Patients With Irreducible Bulbomedullary Compression by Complex Craniovertebral Junction Abnormalities: Operative Nuance

BACKGROUND

During the past decades, the transoral transpharyngeal approach has been advocated as the standard route for the removal of odontoid causing an irreducible symptomatic neural compression. However, it may be potentially associated with a significant built-in morbidity because of the splitting of the soft palate for an adequate working angle, tracheostomy, and incision of the oral mucosa, causing exposure to a higher risk of infection by oral flora.

OBJECTIVE

To describe our experience with the minimally invasive pure endoscopic transnasal odontoidectomy in patients with bulbomedullary compression affected by complex anterior craniovertebral junction abnormalities.

METHODS

Five patients underwent a pure endoscopic neuronavigation-assisted transnasal odontoidectomy with anterior C1 arch preservation. Moreover, the anterior cervical spine column was reconstructed by filling the gap between the C1 arch and the residual C2 body with autologous/artificial bone. Neither tracheostomy nor enteral tube feeding were needed in any case.

RESULTS

A postoperative neurological improvement was observed in all patients. Postoperative imaging confirmed a satisfactory spinal cord decompression with cervical anterior column arthrodesis, and without evidence of instability at follow-up, so far.

CONCLUSION

The endoscopic transnasal approach seems to represent an efficient and safe alternative to the transoral route for the resection of odontoid process causing irreducible bulbomedullary compression. It provides a straightforward and minimally invasive natural surgical corridor to the anterior craniocervical junction, allowing a better working angle with preservation of spine biomechanics, while minimizing potential comorbidities.