Microbiology and Epidemiology of Infectious Spinal Disease

OBJECTIVE: Infectious spinal disease is regarded as an infection by a specific organism that affects the vertebral body, intervertebral disc and adjacent perivertebral soft tissue. Its incidence seems to be increasing as a result of larger proportion of the older patients with chronic debilitating disease, the rise of intravenous drug abuser, and the increase in spinal procedure and surgery. In Korea, studies assessing infectious spinal disease are rare and have not been addressed in recent times. The objectives of this study are to describe the epidemiology of all kind of spinal infectious disease and their clinical and microbiological characteristics as well as to assess the diagnostic methodology and the parameters related to the outcomes. METHODS: A retrospective study was performed in all infectious spinal disease cases presenting from January 2005 to April 2010 to three tertiary teaching hospitals within a city of 1.5 million in Korea. Patient demographics, risk factors, clinical features, and outcomes were assessed. Risk factors entailed the presence of diabetes, chronic renal failure, liver cirrhosis, immunosuppressants, remote infection, underlying malignancy and previous spinal surgery or procedure. We comparatively analyzed the results between the groups of pyogenic and tuberculous spinal infection. SPSS version 14 statistical software was used to perform the analyses of the data. The threshold for statistical significance was established at p<0.05. RESULTS: Ninety-two cases fulfilled the inclusion criteria and were reviewed. Overall, patients of tuberculous spinal infection (TSI) and pyogenic spinal infection (PSI) entailed 20 (21.7%) and 72 (78.3%) cases, respectively. A previous spinal surgery or procedure was the most commonly noted risk factor (39.1%), followed by diabetes (15.2%). The occurrence of both pyogenic and tuberculous spondylitis was predominant in the lumbar spine. Discs are more easily invaded in PSI. At initial presentation, white cell blood count and C-reactive protein levels were higher in PSI compared to TSI (p<0.05). Etiological agents were identified in 53.3%, and the most effective method for identification of etiological agents was tissue culture (50.0%). Staphyococcus aureus was the most commonly isolated infective agent associated with pyogenic spondylitis, followed by E. coli. Surgical treatment was performed in 31.5% of pyogenic spondylitis and in 35.0% of tuberculous spondylitis cases. CONCLUSION: Many previous studies in Korea usually reported that tuberculous spondylitis is the predominant infection. However, in our study, the number of pyogenic infection was 3 times greater than that of tuberculous spinal disease. Etiological agents were identified in a half of all infectious spinal disease. For better outcomes, we should try to identify the causative microorganism before antibiotic therapy and make every effort to improve the result of culture and biopsy.

Cervical Cord Decompression Using Extended Anterior Cervical Foraminotomy Technique

OBJECTIVE: At present, gold-standard technique of cervical cord decompression is surgical decompression and fusion. But, many complications related cervical fusion have been reported. We adopted an extended anterior cervical foraminotomy (EACF) technique to decompress the anterolateral portion of cervical cord and report clinical results and effectiveness of this procedure. METHODS: Fifty-three patients were operated consecutively using EACF from 2008 to 2013. All of them were operated by a single surgeon via the unilateral approach. Twenty-two patients who exhibited radicular and/or myelopathic symptoms were enrolled in this study. All of them showed cervical cord compression in their preoperative magnetic resonance scan images. RESULTS: In surgical outcomes, 14 patients (64%) were classified as excellent and six (27%), as good. The mean difference of cervical cord anterior-posterior diameter after surgery was 0.92 mm (p<0.01) and transverse area was 9.77 mm2 (p<0.01). The dynamic radiological study showed that the average post-operative translation (retrolisthesis) was 0.36 mm and the disc height loss at the operated level was 0.81 mm. The change in the Cobb angle decreased to 3.46, and showed slight kyphosis. The average vertebral body resection rate was 11.47%. No procedure-related complications occurred. Only one patient who had two-level decompression needed anterior fusion at one level as a secondary surgery due to postoperative instability. CONCLUSIONS: Cervical cord decompression was successfully performed using EACF technique. This procedure will be an alternative surgical option for treating cord compressing lesions. Long-term follow-up and a further study in larger series will be needed.

Results of Combined 360-Degree Fusion versus Posterior Fixation Alone for Thoracolumbar Burst Fractures / 대한신경손상학회지

OBJECTIVES: To identify the better option of treatment, we compared the surgical results and efficacy of combined anterior-posterior approach versus posterior fixation alone. METHODS: During a 10 years period from 2002 to 2011, 111 patients with thoracolumbar burst fracture was surgically managed at our institute. 25 patients were managed by a combined anterior-posterior surgery and 86 patients were managed by posterior fusion alone. Radiographs were repeated at 3, 6, 12 and 24 months after operation. Radiologic outcome was evaluated by measuring Kyphotic angulation and vertebral height and the clinical outcome was evaluated by visual analogue scale (VAS) score comparison. RESULTS: The average Cobb's angle difference between immediate post operative and last follow up was 15.0degrees in combined 360-degree fusion group and 7.5degrees in posterior surgery alone group. A corrections of vertebral body height between immediate post operative and last follow up was 2.27 mm in 360-degree fusion group while 0.59 mm in posterior fixation group. The VAS score decreased from 8.4 to 2.2 after post operation 24 months in 360-degree fusion group and the posterior surgery alone group decreased 9.3 to 6.2 after post operation 24 months. CONCLUSION: The combined anterior-posterior approach resulted in less deterioration of the kyphotic angle postoperatively and improvement of vertebral height (sagittal index). Clinical outcome was also better in the combined group.

Intraoperative Vertebral Artery Angiography to Guide C1-2 Transarticular Screw Fixation in a Patient with Athetoid Cerebral Palsy

We present a case of an athetoid cerebral palsy with quadriparesis caused by kyphotic deformity of the cervical spine, severe spinal stenosis at the cervicomedullary junction, and atlantoaxial instability. The patient improved after the first surgery, which included a C1 total laminectomy and C-arm guided righ side unilateral C1-2 transarticular screw fixation. C1-2 fixation was not performed on the other side because of an aberrant and dominant vertebral artery (VA). Eight months after the first operation, the patient required revision surgery for persistent neck pain and screw malposition. We used intraoperative VA angiography with simultaneous fluoroscopy for precise image guidance during bilateral C1-2 transarticular screw fixation. Intraoperative VA angiography allowed the accurate insertion of screws, and can therefore be used to avoid VA injury during C1-2 transarticular screw fixation in comorbid patients with atlantoaxial deformities.

Patterns of Epidural Venous Varicosity in Lumbar Stenosis

OBJECTIVE: Epidural venous varicosity (congestion of the epidural vein) is rarely introduced as an influential factor of clinical symptoms. However, there are several studies suggesting that epidural venous varicosity results in neurologic symptoms. We would like to highlight evidence that epidural venous varicosity results in neurologic symptoms and the relation between epidural venous varicosity and neural structure observed during the surgery. Based on our experiences, we also propose a new classification of epidural venous varicosity. METHODS: 29 patients with symptomatic lumbar stenosis received microsurgical decompression via partial hemilaminectomy. The authors retrospectively reviewed all recorded intraoperative pictures and categorized patterns of venous varicosities with relationship to neural structures. RESULTS: Type A is conditions in which epidural veins are dilated but located parallel to the nerve root on the lateral side of the nerve root and thus do not compress the nerve root. Type B is conditions in which varices are located on the anterior lateral side of the nerve root to compress the nerve root. Type C is conditions in which varices are encircled around the nerve root and compressing the nerve root. CONCLUSION: Epidural venous varicosity is observed in most lumbar stenosis patients with clinical symptoms. Of the types, the types of epidural venous varicosity compressing nerve structures were Type B and Type C. All epidural venous varicosities were removed regardless of classification during operations. Most patients showed relief in clinical symptoms after the operation. We thought to epidural venous varicosity as a factor that causes clinical symptoms of lumbar stenosis.

Sudden Onset of Cauda Equina Syndrome Resulting from Posterior Migration of Lumbar Herniated Disc Without Significant Previous Neurological Signs

While extruded disc fragments are known to migrate anteriorly, posteriorly, or laterally to the theca sac, posterior migration of the fragments is relatively rare and sudden onset of cauda equina syndrome (CES) caused by the migration is extremely rare. The authors experienced a case of CES that was manifested abruptly with sudden paraplegia caused by posterior migration of the lumbar intervertebral disc. A 74-year old man, who had no prior significant neurologic signs or trauma history, visited our emergency center with paraplegia of both lower extremities occurring suddenly when awakened. On magnetic resonance image (MRI) findings, we could detect ruptured disc herniation with severe lumbar stenosis at the L2-3 level. We performed an emergent decompression, and the right posterior migrated disc fragments at L2-3 were intraoperatively observed. The patient was fully recovered himself on the follow up after 3 months of the operation. In conclusion, early operation can result in better outcome in acute paraplegia caused by the posterior migrated disc fragments.

Results of Staged 360-Degree Spinal Fusion for Unstable Thoracolumbar Burst Fracture

OBJECTIVE: The purpose of this study was to evaluate the results obtained in patients who underwent staged 360-degree fusion with posterior fusion following anterolateral fusion for unstable thoracolumbar burst fractures. METHODS: The authors performed 360-degree fusion for thoracolumbar burst fractures in 21 patients between 2006 and 2010. We reviewed the medical records and follow-up data including pre- and postoperative neurological status, spinal canal compromise, segmental kyphotic angulations, complications, visual analogue scale (VAS) pain scores, and revision surgery rates. RESULTS: The mean computed tomography-measured preoperative spinal canal compromise was 55.9+/-20.7%. The segmental kyphotic deformity measured 20.2+/-4.4degrees preoperatively and had been corrected to 4.5+/-2.8degrees postoperatively. The mean vertebral body height loss of 57.4+/-6.9% improved significantly to 1.2+/-0.7% at the final follow-up examination. The mean preoperative VAS pain score of 8.2+/-0.8 improved to 1.5+/-0.6 at discharge. There were no cases of vascular complication, neurological deterioration, or revision surgery. CONCLUSION: Unstable burst fracture of thoracolumbar spine managed by staged posterior fusion and anterolateral interbody fusionis effective for kyphosis correction, significant canal decompression, pain reduction, maintaining stabilization and neurological improvement.

Long-term Follow-up Results of Anterior Cervical Microforaminotomy

OBJECTIVE: We previously reported excellent early and midterm clinical results of anterior cervical microforaminotomy (ACMF) for patients with cervical radiculopathy caused by disc herniation or foraminal stenosis. ACMF is accepted as a minimally invasive functional spinal surgery, but its long-term outcomes are unknown. The purpose of this study is to evaluate the long-term clinical and radiographic results of ACMF. METHODS: We performed a questionnaire survey and retrospective analysis of 13 patients with cervical radiculopathy who underwent ACMF from 1998 to 2002. Clinical and radiographic data from these 13 patients (one-level operations in seven patients, and two-level operations in six patients) were analysed. We measured disc height, sagittal plane displacement and sagittal plane angulation to evaluate instability. RESULTS: Thirteen patients answered the questionnaires. Mean follow-up was 77.3 months (ranged from 498 to 110 months). The surgical outcome was excellent in three patients (23%) and good in nine patients (69%). One patient had only a fair outcome, but there were no cases of recurrence, reoperation or additional surgery. Twelve of 13 patients were satisfied with the results of their surgery. On the average, the loss of disc height was 0.84mm(16.6% of preoperative disc height), increase of displacement was 0.47mm and increase of sagittal plane angulation was 0.65degrees. All patients maintained stability during the follow-up period. Although the patient sample included in this study is a different sample from that surveyed in our previous study of mid-term results, the long-term radiographic outcomes showed that the parameters of instability tended to decrease in comparison to those midterm results. Three-dimensional computed tomography scans showed signs indicative of bone remodeling, including regrowth of the resected bone and gradual fusion around the uncovertebral joint (UVJ) where ACMF was performed. In spite of bone regeneration around the UVJ, the neural foramen appeared to be well maintained in all patients. CONCLUSION: In the long-term, ACMF is clinically effective method for the treatment of cervical radiculopathy, although disc height was decreased and sagittal angulation was increased. UVJ with mild hypermobility that was apparent at midterm appears to be restored during long-term follow-up. The efficacy of this procedure should be evaluated in additional studies involving large patient series.

Adult Langerhans Cell Histiocytosis of the Spine Presenting with Neurological Deficits: A Case Report

The authors report a case of an unusual spinal Langerhans cell histiocytosis (LCH) in an adult presenting with neurological deficits. A 36-year-old woman presented with LCH involving the cervical spine and presenting with neurological deficit. Despite aggressive surgical intervention followed by chemotherapy and radiation therapy, recurrence at the other site occurred repeatedly and the patient eventually succumbed to acute respiratory distress syndrome. LCH is a benign disease that resolves spontaneously, but in cases with neurological deficits, aggressive surgical treatment followed by chemotherapy and radiation therapy should be considered.

Analysis of Empty Sella Secondary to the Brain Tumors

OBJECTIVE: The definition of empty sella syndrome is 'an anatomical entity in which the pituitary fossa is partially or completely filled with cerebrospinal fluid, while the pituitary gland is compressed against the posterior rim of the fossa'. Reports of this entities relating to the brain tumors not situated in the pituitary fossa, have rarely been reported. METHODS: In order to analyze the incidence and relationship of empty sella in patients having brain tumors, the authors reviewed preoperative magnetic resonance imaging (MRI) of 72 patients with brain tumor regardless of pathology except the pituitary tumors. The patients were operated in single institute by one surgeon. There were 25 males and 47 females and mean patient age was 53 years old (range from 5 years to 84 years). Tumor volume was ranged from 2 cc to 238 cc. RESULTS: The overall incidence of empty sella was positive in 57/72 cases (79.2%). Sorted by the pathology, empty sella was highest in meningioma (88.9%, p = 0.042). The empty sella was correlated with patient's increasing age (p = 0.003) and increasing tumor volume (p = 0.016). CONCLUSION: Careful review of brain MRI with periodic follow up is necessary for the detection of secondary empty sella in patients with brain tumors. In patients with confirmed empty sella, follow up is mandatory for the management of hypopituitarism, cerebrospinal fluid (CSF) rhinorrhea, visual disturbance and increased intracranial pressure.

Endoscopic and microscopic anatomy of the upper basal cisterns

No abstract available.

Long Term Clinical and Radiographic Results of Lumbar Spinal Stenosis with Grade I Degenerative Spondylolisthesis after Microsurgical Bilateral Decompression via Unilateral Laminotomy

OBJECTIVE: The purpose of this study was to assess long-term clinical outcomes and radiographic changes in patients with lumbar spinal stenosis with grade I degenerative spondylolisthesis who underwent microsurgical bilateral decompression via unilateral laminotomy, as a minimally invasive surgery. Method: Medical records of twenty-five patients who underwent the surgery between 1999 and 2005 were retrospectively evaluated. Clinical outcomes were evaluated through interviews over telephone with standardized questionnaires. Preoperative and postoperative radiographs were taken from all patients in neutral and dynamic lateral views. The mean follow-up period after surgery was 38.5 months(range 9-57 months). RESULTS: Seventy-two percent of patients were either pain free(48%) or doing well with occasional acetaminophens(24 %), and satisfied with the treatment. The most improved preoperative symptom was neurogenic intermittent claudication, which was ameliorated in 94.7% of patients(excellent 84.2%, good 10.5%, fair 5.3%). Postoperative vertebral slippage was also measured and appeared to be slightly increased but this was not statistically significant. Postoperative dynamic angulation did not change significantly compared to the preoperative value. CONCLUSION: Microsurgical bilateral decompression via unilateral laminotomy achieved a satisfactory decompression and symptomatic relief without extensive destruction of the weight-bearing structures and functional mobile segments. This treatment can be an effective modality for patients with lumbar spinal stenosis associated with mild degenerative spondylolisthesis.

Keyhole Approaches in Neurosurgery. Volume 1 : Concepts and surgical technique

No abstract available.

Anterior Cervical Microforaminotomy / 한양의대학술지

Anterior cervical microforaminotomy is the one of surgical options for treating cervical spondylotic lesions manifested by radiculopathy or myelopathy. This minimally invasive surgical procedure is gaining popularity due to the recent trends of avoidance of spinal fusion resulting in loss of the physiologic spinal motion and developing a future adjacent segment syndrome. Although the spinal fusion still remains a gold standard procedure for degenerative cervical spinal diseases, the eager for maintaining the function of the motion segment is another issue for contemporary spinal surgeons. Anterior cervical microforaminotomy is a target-oriented operation that decompresses the nerve root or spinal cord without destruction of the spinal anatomical functional unit. Unlike to other procedures including total or partial resection of the intervertebral disc, this surgical procedure removes only a small part of the uncovertebral joint or vertebral body. Through this narrow corridor, adequate decompression of the nerve root or spinal cord can be achieved while preserving functional motion. Technical variations of the original anterior cervical microforaminotomy have been continuously developed to minimize the concerns for the postoperative disc height loss and instability. As of now, the anterior cervical microforaminotomy and its technical variations have been proved to be an excellent procedure for treating the cervical spondylotic radiculopathy from literatures review. But the long-term clinical results and the efficacy of the procedure for cervical myelopathy still remain to be seen.

Midterm Follow-up Results of Anterior Cervical Microforaminotomy

OBJECTIVE: We have previously reported excellent early clinical results of anterior cervical microforaminotomy(ACMF) for patients who have cervical radiculopathy from either disc herniation or foraminal stenosis. ACMF is being accepted as a minimal invasive functional spinal surgery, but their long-term outcome is unknown. The goal of this study is to evaluate the midterm clinical and radiological results of ACMF. METHODS: We had undertaken a questionnaire survey and retrospective analysis of 42 patients with cervical radiculopathy who had undergone ACMF from 1998 to 2001. Clinical data from 33 patients(one-level operation in 20 patients, two-level in 13 patients) and radiological data from 21 patients were analysed. RESULTS: Thirty-three patients answered for the questionnaires. Mean follow-up was 48 months(ranged from 26 to 64 months). The surgical outcome was excellent in 18 patients(54.6%) and good in 11 patients(33.3%). One patient showed poor outcome, but there was no case of recurrence, reoperation or additive surgery. Twenty-four patients(79%) satisfied with the results of their surgery. On the average, the loss of disc height was 1.02mm(18% of preoperative disc height), average increase of displacement was 0.83mm, decrease of sagittal plane angulation was 2.03 degrees. All the patients maintained stability during follow-up period. CONCLUSION: In the midterm, ACMF appears to be safe and effective method for the treatment of cervical radiculopathy. To prevent disc height loss and retrolisthesis, skilled disc-preserving technique of ACMF is required and modified technique preserving anterior part of uncovertebral joint may be advantageous.

Pituitary Apoplexy Mimicking Aneurysmal Rupture of Anterior Communicating Artery

Pituitary apoplexy presenting with subarachnoid haemorrhage(SAH) is rare and thus may be easily mistaken for aneurysmal rupture. The authors report a case of pituitary apoplexy presented with SAH mimicking aneurysmal rupture of anterior communicating artery. A 70-year-old woman presented with sudden severe headache, vomiting and drowsiness. Computerized tomography showed diffuse SAH in basal cistern and enhancing sellar mass lesion that was overlooked. Because cerebral angiography showed a suspicious small aneurysmal sac at the origin of anterior communicating artery, we regarded it as an aneurysmal rupture. Craniotomy was performed but we could not find any aneurysm. There was a definite hemorrhagic mass lesion in the sellar and suprasellar area. Histopathological examination revealed a micronodular pituitary adenoma with hemorrhage. The authors stress that pituitary apoplexy must be included in the differential diagnosis of SAH, and proper preoperative radiologic imaging and careful interpretation is demanding for rule out the possibility of pituitary apoplexy.

Periorbital Cerebrospinal Fluid Collection after Orbital Roof Craniotomy and Superolateral Orbital Craniotomy

OBJECTIVE: The aims of this study are to review the incidence of cerebrospinal fluid(CSF) collection complicating the simplified anterior skull base approaches via an eyebrow incision and to identify factors that influence its occurrence and treatment. METHODS: The authors retrospectively analyzed the clinical records and radiologic data of 47 cases(45 patients) who underwent superolateral orbital craniotomy or orbital roof craniotomy via an eyebrow incision at the Eulji Medical Center from September 1998 to August 2002. Forty-three cases were anterior circulation aneurysms and four cases were brain tumors. RESULTS: Significant periorbital CSF collection occurred in 13 cases(11 aneurysms, 2 brain tumors). It was managed with aspiration(8 cases), aspiration and lumbar drainage(2 cases), and dural repair(3 cases). There was no statistically significant difference in operative approaches and patient's characteristics. Periorbital CSF collection occurred in one(16.7%) of six cases using preventive lumbar CSF drainage over two days and in 12 (29.3%) out of 41 cases without it(p>005). CONCLUSION: The authors suggest that careful dissection and water-tight closure of frontal dura, sealing with fibrin glue and compressive dressing of operative wounds are important for the prevention of this complication. However, statistically not significant, preventive lumbar CSF drainage seem to be effective. Aspiration and/or lumbar drainage seem to be sufficient for management of postoperative CSF collection and dural repair could be reserved for refractory cases.

Anaplastic Cystic Meningioma

The authors present a case of malignant cystic meningioma in the left frontal convexity. The patient was 80-year-old male and presented with personality change and walking difficulty. Computerized tomography and magnetic resonance image demonstrated a round mass attached to the left frontal convexity dura. Intratumoral and peritumoral cystic lesions were also seen. Total removal of tumor was performed and the histological dia-gnosis was anaplastic meningioma.

A Simplified Skull Base Approaches for Anterior Circulation Aneurysms: Superolateral Orbital Craniotomy and Orbital Roof Craniotomy viaan Eyebrow Incision

OBJECTIVE: Previous standard surgical approaches for aneurysms of anterior circulation are concerned with possible injury to the normal brain by cerebral retraction. Simplified skull base approaches have been introduced to fulfill the ideal goals of skull base surgery, brain protection and technical minimalism. Superolateral orbital craniotomy and orbital roof craniotomy via eyebrow incision offered sufficient working space for aneurysmal neck clipping of anterior circulaton and have advantages of minimal brain retraction and rapid recovery. METHODS: The concept and technique of the superolateral orbital craniotomy and orbital roof craniotomy are presented in detail. We conducted a retrospective study in which we evaluated the technical aspect of the superolateral orbital craniotomy and orbital roof craniotomy considering the indications, limitations, and complications of these approaches. RESULTS: The superolateral orbital craniotomy and orbital roof craniotomy provide an ample space to access the neurovascular structure of the anterior skull base without using brain retractors, enable rapid anatomical reconstruction for closure and acceptable cosmetic results. CONCLUSION: The superolateral orbital craniotomy and orbital roof craniotomy via eyebrow incision offer better surgical possibilities and approach related morbidity than conventional approaches in the treatment of anterior circulation aneurysms.

A Simplified Skull Base Approaches for Anterior Circulation Aneurysms: Superolateral Orbital Craniotomy and Orbital Roof Craniotomy viaan Eyebrow Incision

OBJECTIVE: Previous standard surgical approaches for aneurysms of anterior circulation are concerned with possible injury to the normal brain by cerebral retraction. Simplified skull base approaches have been introduced to fulfill the ideal goals of skull base surgery, brain protection and technical minimalism. Superolateral orbital craniotomy and orbital roof craniotomy via eyebrow incision offered sufficient working space for aneurysmal neck clipping of anterior circulaton and have advantages of minimal brain retraction and rapid recovery. METHODS: The concept and technique of the superolateral orbital craniotomy and orbital roof craniotomy are presented in detail. We conducted a retrospective study in which we evaluated the technical aspect of the superolateral orbital craniotomy and orbital roof craniotomy considering the indications, limitations, and complications of these approaches. RESULTS: The superolateral orbital craniotomy and orbital roof craniotomy provide an ample space to access the neurovascular structure of the anterior skull base without using brain retractors, enable rapid anatomical reconstruction for closure and acceptable cosmetic results. CONCLUSION: The superolateral orbital craniotomy and orbital roof craniotomy via eyebrow incision offer better surgical possibilities and approach related morbidity than conventional approaches in the treatment of anterior circulation aneurysms.