Retro-odontoid synovial cyst resected via an anterolateral approach without fusion

Purpose

Retro-odontoid synovial cysts are rare and attributable to degenerative changes in the atlantoaxial joints. An anterolateral approach facilitates access to lesions located anterior to the craniocervical junction without harming the atlantoaxial joints, and can also treat small lesions in the ventral mid-portion of the craniocervical junction without compression of spinal cord.

Methods

We present herein the case of a 70-year-old man with a retro-odontoid synovial cyst. A ventral midsection mass was present at the level of the atlantoaxial joint. The compressed anterior medulla led to neurological deficits. Slight atlantoaxial instability was radiologically present. An intradural cyst resection without fusion was performed via the anterolateral approach. The diagnosis of a synovial cyst was histologically confirmed.

Results

The patient was followed up for 3 years and exhibited improvements in the neurological deficits. There were no recurrence and postoperative deterioration of atlantoaxial instability.

Conclusions

The anterolateral approach for the retro-odontoid synovial cyst had little effect on C1–2 instability and yielded neurological improvements.

     

Adult-onset intradural spinal teratoma: report of 18 consecutive cases and outcomes in a single center

Study design

Eighteen consecutive patients with adult-onset intradural spinal teratoma underwent surgical treatment in our center from 1998 to 2013.

Background and purpose

Teratoma is defined as a neoplasm composed of elements derived from three germ cell layers (ectoderm, endoderm and mesoderm). Intraspinal teratoma is extremely rare and accounts for 0.2–0.5% of all spinal cord tumors. Moreover, teratoma occurs primarily in neonates and young children. Adult-onset intradural spinal teratoma is even rare. The aim of this study was to discuss the clinical characteristics, diagnosis and therapeutic strategies of adult-onset intradural spinal teratoma.

Methods

This retrospective study included 18 consecutive adult patients with intradural teratoma who were surgically treated in our center between 1998 and 2013. The clinical features, pathogenesis, diagnostic strategies and surgical outcomes were discussed. Neurological function outcomes were evaluated by the JOA scoring system.

Results

Of the 18 included patients, 4 patients received subtotal resection and the other 14 patients received total resection. All the 18 cases were diagnosed with mature teratoma. The mean follow-up period was 79.7 (median 60.5; range 27–208) months. Local recurrence occurred in two of the four patients who underwent subtotal resection and in no patient who underwent total resection. The neurologic status improved in 16 cases and remained unchanged in the other two patients.

Conclusions

Adult-onset intradural spinal teratoma is extremely rare. To the best of our knowledge, this is the largest series of patients with this disease. Despite the slow-growth and indolent nature, radical resection remains the recommended treatment to reduce tumor recurrence.

     

Complex cervical spondylotic myelopathy: a report of two cases and literature review

Study Design

A report of two cases with complex cervical spondylotic myelopathy (CSM) and review of the literature.

Objective

To describe two unique patients with complex CSM due to simultaneous anomalies as anteroposterior compressions of the spinal cord in both upper and lower cervical spine, caused by hypertrophic transverse ligament of atlas (TLA), dysplasia of the posterior arch of atlas, disc herniation, hypertrophic ligamentum flavum and osteophytes.

Methods

We present such two cases with clinical, imageological presentations, and describe the surgical procedure, to which both patients responded favorably.

Results

The neurological functions of both patients gradually improved according to the JOA scores and VAS scores in preoperative clumsiness and gait disturbance during the mean follow-up period lasted for 18 months. The latest plain radiographs and computed tomography (CT) revealed good fusion without instrumental failure and magnetic resonance imaging (MRI) showed good decompression of C1–7 spinal cord of both patients. Both patients are progressively followed-up.

Conclusion

Posterior surgical approach as C1–7 laminectomy with fixations or occipital-cervical fusions may obtain better reconstructions of the cervical spine and good neurological recovery for the patients with complex CSM we present. However, the incidence and ethnic predisposition for the patients with complex CSM are still unclear.

     

New concept of pathogenesis of impaired circulation in traumatic cervical spinal cord injury and its impact on disease severity: case series of four patients

Purpose

The purpose of this study is to justify a new concept of the pathogenesis of secondary changes in the cervical spinal cord, and its correlation with the depth of development of neurological disorders in spinal injury.

Methods

Standard magnetic resonance imaging examination and angiography of the cervical and vertebral arteries of four patients were performed to diagnose the prevalence rate of ischemia and edema, and examine the spinal cord vasculature. Correlation of the data obtained with the neurological status was performed.

Results

Collateral circulation is most apparent in the upper-cervical region, above the C4 vertebra. Following occlusion of the vertebral artery, the circulation above the C4 vertebra is performed by collaterals of the ascending cervical artery. With extensive damage to the spinal cord, the intensity of edema and ischemia can be regarded as the effect of damage to radicular medullary arteries, which are injured in the intervertebral foramen. Secondary changes of the spinal cord are most apparent by impaired circulation in the artery of cervical enlargement.

Conclusions

Collateral circulation is a significant factor that limits the damage to the cervical spinal cord. Impaired circulation in the artery of cervical enlargement is significant in extension of perifocal ischemia. The appearance of early arteriovenous shunting in the region of a primary spinal cord injury (contusion focus) by angiography is pathognomonic. The data obtained open a perspective for the endovascular treatment of spinal cord injury.

     

Management of a 3-year-old with an unstable C6–C7 diastasis without quadriplegia

Background

Caring for pediatric spine trauma patients places spine surgeons in situations that require unique solutions for complex problems. Recent case reports have highlighted a specific injury pattern to the lower cervical spine in very young children that is frequently associated with complete spinal cord injury.

Methods

This report describes the presentation and treatment of a C6–C7 dislocation in a 3-year-old patient with an incomplete spinal cord injury. The highly unstable cervical injury and the need to prevent neurologic decline added complexity to the case.

Results

A multi-surgeon team allowed for ample manpower to position the patient; with individuals with the requisite training and experience to safely move a patient with a highly unstable cervical spine. Initial closed reduction under close neurophysiologic monitoring, posterior fusion and immediate anterior stabilization lead to a successful patient outcome with preserved neurologic function. A traumatic cerebrospinal fluid leak, while a concern early on during the procedure, resolved without direct dural repair and did not complicate the patient’s fusion healing. Additional anterior stabilization and fusion allowed long-term stability with bone healing that may not be achievable with posterior fixation and/or soft tissue healing alone.

Conclusions

Familiarity with the challenges and solutions presented in the case may be useful to surgeons who could face a similar challenge in the future.

     

Intradural migration of cervical posterior fixation rods

Background

Instrumented spinal fixations are an important tool in the management of traumatic conditions and delayed complications are rare.

Case report

We present a case of open reduction and fixation of traumatic C5/6 facet fracture dislocation with late complication in the form of intradural hardware migration.

Conclusion

To our knowledge, this is the first report of an intradural rod migration distant to the initial surgery in a patient without posterior decompression. This highlights the need for long-term follow-up of patients with spinal instrumentation.

     

Surgical management of ventrally located spinal meningiomas via posterior approach

Background

Spinal meningioma is a relatively common tumor among intradural extramedullary spinal tumors. When the locus of the meningioma is located on the ventral side, tumor removal, dura mater resection, and reconstruction via a posterior approach safety become technically difficult.

Methods

Twelve patients, who received surgical treatment for ventral spinal meningioma via a posterior approach, were included. There were three male and nine female patients, with an average age of 66.3 years (47–88 years). The average observation period was 55.4 months (22–132 months). In these cases, we analyzed the spinal level of tumor position, histopathological type (subtype), the grade of tumor resection (Simpson grade), pre- and post-operative walking state (Nurick grade), perioperative neurological complications, and the recurrence.

Results

Spinal meningioma occurred in the cervical spinal cord in three cases, with a further nine cases in the thoracic spinal cord. Histopathologically, all 12 tumors were assessed as grade I on the WHO classification system (eight cases of meningothelial type and four cases of psammomatous type). The level of tumor resection was Simpson grade I resection for two cases and Simpson grade II resection for the remaining ten cases. The average of Nurick grade improved from 3.3 preoperatively to 1.3 postoperatively. In all cases, we identified no neurological complications. One incident of tumor recurrence was identified 11 years after an operation involving a Simpson grade II resection

Conclusion

Posterior approaches provide adequate exposure to safely remove ventrally located meningioma. Posterior exposures with lateral bone resection, dentate ligament division, provide also adequate exposure for safe removal.

     

The impact of surgeon volume on patient outcome in spine surgery: a systematic review

Purpose

Recently, strategies aimed at optimizing provider factors have been proposed, including regionalization of surgeries to higher volume centers and adoption of volume standards. With limited literature promoting the regionalization of spine surgeries, we undertook a systematic review to investigate the impact of surgeon volume on outcomes in patients undergoing spine surgery.

Methods

We performed a systematic review examining the association between surgeon volume and spine surgery outcomes. To be included in the review, the study population had to include patients undergoing a primary or revision spinal procedure. These included anterior cervical discectomy and fusion (ACDF), anterior/posterior cervical fusion, laminectomy/decompression, anterior/posterior lumbar decompression with fusion, discectomy, and spinal deformity surgery (spine arthrodesis).

Results

Studies were variable in defining surgeon volume thresholds. Higher surgeon volume was associated with a significantly lower risk of postoperative complications, a lower length of stay (LOS), lower cost of hospital stay and a lower risk of readmissions and reoperations/revisions.

Conclusions

Findings suggest a trend towards better outcomes for higher volume surgeons; however, further study needs to be carried out to define objective volume thresholds for individual spine surgeries for surgeons to use as a marker of proficiency.

     

Skene’s gland cyst: a simple marsupialization technique

Introduction and hypothesis

We present a simple approach to the marsupialization of a Skene’s gland cyst.

Methods

Our technique facilitates suture placement to exteriorize the cyst wall to efficiently treat a distal Skene’s gland cyst and reduce the risk of recurrence.

Conclusion

Marsupialization is an accepted option for the surgical management of Skene’s gland cyst. This technique is an effective and streamlined approach to Skene’s gland marsupialization.

     

Factors that regulate spinal cord position after expansive open-door laminoplasty

Introduction

Although appropriate dorsal migration of the spinal cord is a desired end point of cervical laminoplasty, it is difficult to predict in advance the spinal cord position after surgery and to control it during surgery. The aim of the present study was to investigate the factors that affect postoperative spinal cord position after cervical laminoplasty using multivariable analysis.

Materials and methods

We retrospectively assessed 56 consecutive patients with cervical spondylotic myelopathy treated by open-door laminoplasty. The postoperative anterior space of the spinal cord was measured at 204 levels, and its maximum value was measured at 56 levels within the decompressed area. To identify the factors that regulate the postoperative spinal cord position, we evaluated seven radiological parameters, including the C3–C7 lordosis angle (LA), LA of the decompressed area, C3–C7 spinal cord lordosis angle (SCLA), SCLA of the decompressed area, spinal canal sagittal diameter at C5, number of expanded lamina, and postoperative dural sac diameter.

Results

The postoperative anterior space of the spinal cord was 5.5 ± 1.4 mm, and its maximum value was 6.4 ± 1.3 mm. A multiple linear regression analysis revealed that the number of expanded laminae (standardized partial regression coefficient: β = 0.17, p = 0.009) and dural sac diameter (β = 0.43, p < 0.001) was significantly associated with anterior space of the spinal cord. Although these parameters were also significantly associated with the maximum value, their relative contributions were reversed; β = 0.49 (p < 0.001) for the number of expanded laminae and 0.25 (p = 0.029) for the dural sac diameter.

Conclusions

The number of expanded laminae and dural sac diameter was significantly associated with the spinal cord position after laminoplasty. These factors could help to predict spinal cord position following laminoplasty and achieve adequate indirect decompression of the spinal cord.

     

Cervical spondylotic myelopathy: the relevance of the spinal cord back shift after posterior multilevel decompression. A systematic review

Purpose

Spinal cord back shift has been considered the desired end point of posterior decompression procedures for cervical spondylotic myelopathy (CSM). However, the association with postoperative outcomes has not been definitively demonstrated. The aim of this review is to obtain an overview of the current knowledge on the spinal back shift after posterior decompression to clarify the main controversial aspects and provide recommendations for further studies on the subject.

Methods

A comprehensive quantitative review of the literature was performed. Bibliographic databases were searched using the following keywords: spinal cord drift, spinal cord shift, CSM, ossification of posterior longitudinal ligament, posterior decompression, laminoplasty, laminectomy and fusion.

Results

Twelve eligible studies were included. The authors measured the spinal cord back shift in different ways, using the posterior edge, the center or the anterior margin of the spinal cord as reference points. Six studies analyzed the correlation between the spinal cord back shift and the recovery rate, but their results were discordant. The correlation between the posterior cord migration and cervical alignment was not confirmed in all studies.

Conclusions

There is a need for a consensus on the best way to measure the spinal cord back shift. The action of multiple factors on spinal cord back shift can explain the difference in the results collected from the studies. We recommend further studies to clarify the behavior of the spinal cord after posterior decompression and its clinical meaning.

     

Anterior cervical osteotomy: operative technique

Purpose

Correction of rigid cervical deformities often requires osteotomies to realign the spine. Cervical pedicle subtraction osteotomy can be technically challenging due to the presence of cervical nerve roots and usually can only be performed at C7 or T1 due to the presence of vertebral arteries. In contrast, anterior cervical osteotomy can be performed throughout the cervical spine and is a safe and effective method for correction of both sagittal and coronal cervical deformities. We describe the anterior cervical osteotomy technique with a review of the pertinent literature.

Methods

A step-by-step technical guide for anterior cervical osteotomy is provided with a focus on surgical nuances and complication avoidance. Two illustrative cases of fixed sagittal and coronal deformities are included to demonstrate the substantial amount of deformity correction achievable using the anterior cervical osteotomy technique.

Results

Both patients in the illustrative cases had successful clinical and radiographic outcome following deformity correction utilizing the anterior cervical osteotomy technique.

Conclusion

Anterior cervical osteotomy is a safe and effective technique for correction of rigid cervical deformities. Spine surgeons should be familiar with this technique to optimize clinical outcome in patients undergoing cervical deformity correction.

     

Die fixierte zervikale hochgradige Kyphose

Background

Surgical correction of severe and rigid cervical kyphosis with chin-on-chest deformity poses significant challenges to both the patient and surgeon once surgery is considered as the treatment of choice.

Objectives

This article presents the current concepts of corrective surgery for patients with severe and rigid cervical kyphosis.

Material and methods

Narrative review and report of clinical experience.

Results

The treatment of severe cervical kyphosis indicates a dedicated deformity assessment, the analysis of regional and global imbalance, the identification of spinal sagittal plane compensation mechanisms, detailed radiographic and clinical planning of corrective surgery, and the meticulous performance of surgical correction. Most recent large-scale studies serve as evidence for the benefit of surgical correction and outline the complications that need to be targeted during and after surgery.

Conclusion

Surgical correction of severe cervical kyphosis can be a pleasant and life-changing event for the disabled patient.

     

Cervical Spine Surgery: An Historical Perspective

Background

Continued innovation in surgery requires a knowledge and understanding of historical advances with a recognition of successes and failures.

Questions/purposes

To identify these successes and failures, we selectively reviewed historical literature on cervical spine surgery with respect to the development of (1) surgical approaches, (2) management of degenerative disc disease, and (3) methods to treat segmental instability.

Methods

We performed a nonsystematic review using the keywords “cervical spine surgery” and “history” and “instrumentation” and “fusion” in combination with “anterior approach” and “posterior approach,” with no limit regarding the year of publication. Used databases were PubMed and Google Scholar. In addition, the search was extended by screening the reference list of all articles.

Results

Innovative surgical approaches allowed direct access to symptomatic areas of the cervical spine. Over the years, we observed a trend from posterior to anterior surgical techniques. Management of the degenerative spine has evolved from decompressive surgery alone to the direct removal of the cause of neural impingement. Internal fixation of actual or potential spinal instability and the associated instrumentation have continuously evolved to allow more reliable fusion. More recently, surgeons have developed the basis for nonfusion surgical techniques and implants.

Conclusions

The most important advances appear to be (1) recognition of the need to directly address the causes of symptoms, (2) proper decompression of neural structures, and (3) more reliable fusion of unstable symptomatic segments.

     

Esophageal perforation after anterior cervical surgery: a review of the literature for over half a century with a demonstrative case and a proposed novel algorithm

Purpose

To review relevant data for the management of esophageal perforation after anterior cervical surgery.

Methods

A case of delayed esophageal perforation after anterior cervical surgery has been presented and the relevant literature between 1958 and 2014 was reviewed. A total of 57 papers regarding esophageal perforation following anterior cervical surgery were found and utilized in this review.

Results

The treatment options for esophageal perforation after anterior cervical surgery were discussed and a novel management algorithm was proposed.

Conclusion

Following anterior cervical surgery, patients should be closely followed up in the postoperative period for risk of esophageal perforation. Development of symptoms like dysphagia, pneumonia, fever, odynophagia, hoarseness, weight loss, and breathing difficulty in patients with a history of previous anterior cervical surgery should alert us for a possible esophageal injury. Review of the literature revealed that conservative treatment is advocated for early and small esophageal perforations. Surgical treatment may be considered for large esophageal defects.

     

Die C5-Parese nach multisegmentaler zervikaler Dekompression

Background

Anterior cervical discectomy and fusion (ACDF) as well as posterior instrumentation of the cervical spine are frequently performed surgeries for cervical disc prolapse or spinal stenosis. Surgery itself harbors a very low risk of adverse events. Postoperative palsy of the C5 nerve root, however, is a severe complication and its origin is still not fully understood. The risk of such a C5 palsy is reported to be between 0 and 30%; 5% on average according to the literature.

Objectives

To describe underlying pathomechanisms and to recommend strategies for risk reduction.

Materials and methods

An extensive literature research via Medline was performed.

Results

Potential risk factors are male gender, sagittal diameter below 5.6?mm, anterior approach, and higher age.

Conclusions

Currently available data only originates from retrospective or anatomical studies. A prospective register study with the goal to put light on the pathogenesis is currently being performed.

     

Intra-thymic bronchogenic cyst an extremely rare tumor of anterior mediastinum in adults

Background

Intra-thymic bronchogenic cysts are a rare entity but should be considered in the differential of all non-invasive thymic masses.

Case presentation

We describe a 50-year-old patient who was found to have an incidental thymic mass on computer tomography of the chest. Non-invasive thymoma was suspected and a thoracoscopic thymectomy was performed. Final pathology revealed a bronchogenic cyst.

Conclusion

Intra-thymic bronchogenic cysts are extremely rare tumors of the anterior mediastinum. It should be considered in differential diagnosis of anterior mediastinal masses.

     

Autonomic hyperreflexia after spinal cord injury managed successfully with intravenous lidocaine: a case report

Background

Some paraplegic patients may wish undergo some surgical procedures, like urological procedures, without anesthesia. However, these patients can develop autonomic hyperreflexia if cystoscopy is performed without anesthesia.

Case presentation

We present a case of severe autonomic hyperreflexia in a 44-year-old male with spinal cord injury at the level of T4 during urologic procedure under sedation and analgesia successfully treated with intravenous lidocaine.

Conclusions

This case illustrates that patients with spinal cord injuries are likely to develop autonomic hyperreflexia during urological procedures performed without anesthesia. Health professionals should educate spinal cord injury patients regarding risks of this serious condition and be aware to prevent and manage autonomic hyperreflexia. In an acute episode, nifedipine, nitrates and captopril are the most commonly used and recommended agents. To our knowledge, this is the first case report of severe autonomic hyperreflexia treated successfully with intravenous lidocaine.

     

Core herniation after implantation of a cervical artificial disc: case report

Introduction

Cervical artificial discs (CADs) represent an established surgical option in selected patients with cervical spinal disc degeneration. Though CADs have been available for many years, there is a lack of information concerning long-term safety, durability and implant-related failure rates.

Materials and methods

The authors describe the failure of a M6-C CAD (Spinal Kinetics, Sunnyvale, CA, USA).

Results

Eight years after implantation of a CAD of the M6 type, a 39-year-old female presented with new clinical signs of cervical myelopathy. Radiologically, medullar compression due to posterior core herniation was the suspected cause. The damaged CAD was removed and the segment fused. During revision surgery, rupture of the posterior structures could be detected. Possible mechanisms leading to implant failure are discussed.

Conclusion

As there is no standard regarding clinical and radiological follow-up for patients with CADs, radiological long-term follow-up investigations seem to be justified for exclusion of implant failure.

     

Favourable outcome of posterior decompression and stabilization in lordosis for cervical spondylotic myelopathy: the spinal cord “back shift” concept

Purpose

Surgical management of patients with multilevel CSM aims to decompress the spinal cord and restore the normal sagittal alignment. The literature lacks of high level evidences about the best surgical approach. Posterior decompression and stabilization in lordosis allows spinal cord back shift, leading to indirect decompression of the anterior spinal cord. The purpose of this study was to investigate the efficacy of posterior decompression and stabilization in lordosis for multilevel CSM.

Methods

36 out of 40 patients were clinically assessed at a mean follow-up of 5, 7 years. Outcome measures included EMS, mJOA Score, NDI and SF-12. Patients were asked whether surgery met their expectations and if they would undergo the same surgery again. Bone graft fusion, instrumental failure and cervical curvature were evaluated. Spinal cord back shift was measured and correlation with EMS and mJOA score recovery rate was analyzed.

Results

All scores showed a significative improvement (p < 0.001), except the SF12-MCS (p > 0.05). Ninety percent of patients would undergo the same surgery again. There was no deterioration of the cervical alignment, posterior grafted bones had completely fused and there were no instrument failures. The mean spinal cord back shift was 3.9 mm (range 2.5–4.5 mm). EMS and mJOA recovery rates were significantly correlated with the postoperative posterior cord migration (P < 0.05).

Conclusions

Posterior decompression and stabilization in lordosis is a valuable procedure for patients affected by multilevel CSM, leading to significant clinical improvement thanks to the spinal cord back shift. Postoperative lordotic alignment of the cervical spine is a key factor for successful treatment.