The MP3 surgeon and the opera fan: comment.
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Australia↗
Biomedical subjects
Charles Teo
Publications and source records attributed to Charles Teo.
Endoscope-assisted microvascular decompression for trigeminal neuralgia: technical case report.
OBJECTIVE: Microvascular decompression may fail to relieve trigeminal neuralgia because a compressing vessel at the root entry zone may be overlooked during surgery. Alternatively, effective decompression may not always be achieved with the visualization provided by the microscope alone. We theorized that the addition of an endoscope would improve the efficacy of microvascular decompression. METHODS: We retrospectively reviewed microvascular decompression of the trigeminal nerve in 114 patients. Before closure, the endoscope was used to inspect the root entry zone. When visualization with the microscope was poor, the endoscope was used to identify an aberrant vessel and to perform or improve the subsequent decompression. RESULTS: Of 114 patients who underwent microvascular decompression, 113 successfully underwent endoscopy. In 38 patients (33%), endoscopy revealed arteries that were poorly seen (25%) or not seen at all (8%) with the microscope. At a mean follow-up period of 29 months, the pain was completely relieved in 112 patients (99.1%), all of whom were off medication. Complications included trigeminal dysesthesias in nine patients and a wound infection, partial hearing loss, and complete hearing loss in one patient each. The overall complication rate was 9%. CONCLUSION: Endoscopy is a simple and safe adjunct to microscopic exploration of the trigeminal nerve. The markedly improved visualization increases the likelihood of identifying the offending vessel and consequently of achieving satisfactory decompression of the nerve. Thus far, the success rate has been high, and the complication profile is comparable to that of other large series.
Adult↗
Application of endoscopy to the surgical management of craniopharyngiomas.
OBJECTIVE: The purpose of this study was to evaluate the efficacy of a minimally invasive/endoscopic approach to craniopharyngiomas (CPGs) given that the surgical aim was a complete excision of the tumor as a single stage procedure. The endoscope can be used with both a subfrontal and a transsphenoidal approach. METHODS: This study is a retrospective review of 36 operative patients who were seen by one surgeon. All patients had attempted complete excision. RESULTS: Patients were divided into three groups according to their preoperative status. Those in group 1 had no previous treatment and fared well, although all developed postoperative diabetes insipidus. Those in group 2 had previous surgery only and also did well with repeat surgery. Those in group 3 had been treated previously with surgery and radiotherapy and, apart from a single exception, did poorly. CONCLUSION: The endoscopic, minimally invasive approach is versatile and effective in the surgical management of both first-time and repeat cases of CPG. It offers superior visualization of surrounding neurovascular structures and allows a more complete resection of tumor. It can be used for a cranial or a nasal approach to these tumors. Sadly, it failed to prevent postoperative endocrinopathy.
Craniopharyngioma↗
Long-term reliability of endoscopic third ventriculostomy.
OBJECTIVE: To describe the short-term operative success and the long-term reliability of endoscopic third ventriculostomy (ETV) for treatment of hydrocephalus and to examine the influence of diagnosis, age, and previous shunt history on these outcomes. METHODS: We retrospectively analyzed 203 consecutive patients from a single institution who had ETV as long as 22.6 years earlier. Patients with hydrocephalus from aqueduct stenosis, myelomeningocele, tumors, arachnoid cysts, previous infection, or hemorrhage were included. RESULTS: The overall probability of successfully performing an ETV was 89% (84-93%). There was support for an association between the surgical success and the individual operating surgeon (odds ratios for success, 0.44-1.47 relative to the mean of 1.0, P = 0.08). We observed infections in 4.9%, transient major complications in 7.2%, and major and permanent complications in 1.1% of 203 procedures. Age was strongly associated with long-term reliability. The longest observed reliability for the 13 patients 0 to 1 month old was 3.5 years. The statistical model predicted the following reliability at 1 year after insertion: at 0 to 1 month of age, 31% (14-53%); at 1 to 6 months of age, 50% (32-68%); at 6 to 24 months of age, 71% (55-85%); and more than 24 months of age, 84% (79-89%). There was no support for an association between reliability and the diagnostic group (n = 181, P = 0.168) or a previous shunt. Sixteen patients had ETV repeated, but only 9 were repeated after at least 6 months. Of these, 4 procedures failed within a few weeks, and 2 patients were available for long-term follow-up. CONCLUSION: Age was the only factor statistically associated with the long-term reliability of ETV. Patients less than 6 months old had poor reliability.
Adolescent↗
Application of endoscopy to third ventricular tumors.
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Adolescent↗
Neuro-oncologic applications of endoscopy.
Neurooncology, in all its aspects, provides an ideal venue for the application of endoscopy. The main obstacle to its use has been neuro-surgeons' lack of familiarity with the techniques and their advantages. As the neurooncologic surgeon uses the endoscope more, endoscopy will take its rightful place in the surgeon's armamentarium. The advantages of improved visualization of intraventricular pathology, better management of tumor-related hydrocephalus, less morbid biopsies, and minimally invasive removal of intraventricular tumors are invaluable adjuncts to traditional tumor management. Furthermore, endoscopy is the logical next step for surpassing the limitations of traditional microsurgery. Endoscopy is still in its infancy. Rigorous application of the technology is increasingly allowing us to provide our patients the most maximally effective and minimally invasive surgery possible.
Biopsy↗
Ependymoma.
INTRODUCTION: The management of a patient with an ependymoma is controversial. Although the necessity for a multi-disciplined approach is accepted, the exact roles for all disciplines are poorly defined. REVIEW: This review article examines the current status of histopathological and cytogenetic diagnosis, surgical, chemotherapeutic and radiotherapeutic treatment and future directions.
Brain Neoplasms↗
Endoscopic assisted posterior decompression for spinal neoplasms.
The authors describe a technique for anterior thoracic decompression via a posterolateral approach for spinal metastatic disease followed by anterior and posterior column stabilization. We discuss the benefits of decompression via a posterolateral approach including minimization of cord retraction, avoidance of thoracotomy, early mobilization and shorter hospital stay. Technical details are reviewed and difficulties of the approach discussed.
Decompression, Surgical↗
Complete endoscopic removal of colloid cysts: issues of safety and efficacy.
The ideal management of colloid cysts is controversial. Treatment options include shunting procedures, stereotactic cyst aspiration, open craniotomy for microsurgical removal, and endoscopic removal. Although recent literature would suggest endoscopic removal is a reasonable approach, issues of safety and efficacy have dampened the universal acceptance of this surgical modality. The author performed a retrospective anaylsis to address these controversial issues. The charts of all patients in whom endoscopic removal of colloid cysts was performed by the primary author at the University of Arkansas for Medical Sciences were reviewed. Eighteen patients underwent this procedure over the last 5 years. The mean patient age was 32 years, and the mean follow-up period was 32 months. In all patients complete tumor removal was macroscopically and radiologically confirmed, and there were no permanent deficits. Two patients suffered aseptic meningitis without long-term sequelae. There were no deaths and no incidence of tumor recurrence. The results of this series support those previously published that underscore the advantages of endoscopic removal of colloid cysts. The procedure is safe and effective. Longer follow-up review is required to address the issue of duration of tumor-free survival.
Journal Article↗