D. Vanhauwaert

Endoscopic coagulation of choroid plexus hyperplasia

Hydrocephalus is a clinical disorder resulting from an imbalance between the production of CSF and its resorption, of which the latter is mostly a disadvantage. In rare cases of choroid plexus papilloma or carcinoma, hydrocephalus is due to an overproduction of CSF. Choroid plexus hyperplasia (CPH) is a distinct clinicopathological entity in which the enlarged choroid plexus produces large amounts of CSF. Historically, patients with CPH were treated by shunt procedures or by microsurgical removal of the choroid plexus, which is associated with a high complication rate. In this paper the authors show that endoscopic plexus coagulation can result in restoring the equilibrium of the intracranial fluid volumes, resulting in shunt independency. In this way, both the shunt-related complications and the bleeding risks of microsurgical plexectomy are avoided. In instances of hydrocephalus, thorough efforts should be made to demonstrate the underlying pathophysiology to choose the optimal treatment, of which shunt procedures should receive the least priority.

Endoscopic Treatment of Temporal Arachnoid Cysts in 34 Patients

INTRODUCTION Arachnoid cysts are lesions present in 1% of the population and usually found in the temporal fossa. Clinical and radiologic presentations can differ greatly. Despite intensive research, it is still debatable which patients will benefit from surgery. OBJECTIVE This study aims to investigate the pretreatment parameters influencing the outcome after neuroendoscopic treatment of temporal arachnoid cysts. MATERIALS AND METHODS A retrospective analysis of 34 patients who underwent an endoscopic fenestration of a temporal arachnoid cyst between July 1991 and December 2013 was performed. RESULTS In symptomatic patients, there was a clinical improvement in 76.4% of cases. The best results were found in treating symptoms related to intracranial hypertension, acute neurologic defects, and macrocrania. Patients with temporal lobe epilepsy improved after cyst fenestration in 33.3% of cases. Behavioral problems and psychomotor retardation remained largely unchanged. Patients with a complex neurologic presentation, often from a congenital syndrome and combined with an intellectual disability, had the least benefit from endoscopic surgery. Radiologic follow-up showed a cyst volume decrease in 91.2% of cases. Complications were present in 29.4%, but were mostly minor and transient. CONCLUSION This study demonstrates that patients with symptoms related to intracranial hypertension, acute neurologic deficits, and macrocrania have the best postoperative outcome. Also, patients with ipsilateral temporal lobe epilepsy seem to be good candidates for endoscopic arachnoid cyst fenestrations. In complex neurologic disorders without one of the previously mentioned symptoms, endoscopy remains less successful.

Migration of pump for intrathecal drug delivery into the peritoneal cavity: case report

BACKGROUND We report on a patient in whom a subfascially implanted pump for the intrathecal delivery of baclofen spontaneously migrated into the peritoneal cavity. CASE DESCRIPTION A 54-year-old male patient presented with a refilling problem of a drug pump that had been implanted 16 months earlier subfascially through a right-sided incision 10 cm below the costal margin. Because we were unable to refill the pump even under fluoroscopy, we presumed a backward turning of the pump. At exploration, we found that the deeper part of the pocket had spontaneously eroded and had caused the migration of the pump into the peritoneal cavity. The peritoneum and the abdominal wall were closed and the pump was placed in a subcutaneous pouch. We suppose that the migration of the pump was due to its particular implantation site with the lower extent of the device at or below the level of the linea semilunaris. Below this line, the aponeuroses of all 3 lateral abdominal muscles pass in front of the rectus muscle, leaving only the transversal fascia underneath the rectus, which is not a solid layer. Not considering this anatomical detail may facilitate the inward migration of implanted material. CONCLUSION When creating a pocket for subfascial implantation, a high subcostal incision should be used so that the lower extent of the pocket will still be above the level of the linea semilunaris, hence ensuring a strong fascial layer between the pump and the peritoneum.

Intracranial dural arteriovenous fistula successfully treated by combined open–endovascular procedure

Intracranial dural arteriovenous fistulas constitute a rare though potentially devastating disease. Because the arterial (high-pressure) blood flow drains directly into the low-pressure venous system, there is a high risk of bleeding and associated neurological deficit. The classifications by Borden and Cognard underline the correlation between bleeding risk and venous drainage pattern of the fistula. There are different treatment options for this vascular pathology, which always poses a challenge for the physicians involved to offer the optimal treatment for an individual patient. This case report illustrates how combining forces between the neurosurgical and endovascular team benefits outcome. Simultaneously, this contributes to the growing amount of evidence that a new endovascular technique with transarterial ONYX embolisation enables complete obliteration of the vascular malformation.

Cystoperitoneal shunt as alternative treatment for a giant thoracic meningocele in a patient with neurofibromatosis

BACKGROUND Thoracic meningoceles are associated with neurofibromatosis 1 in 60% to 85% of all cases. Usually, these meningoceles remain asymptomatic, but back pain, headache, cough, and dyspnea are possible manifestations. Often, there is an associated kyphoscoliotic deformity of the thoracic spine. CASE DESCRIPTION A 60-year-old woman known in our department after a fossa posterior decompression for an Arnold-Chiari malformation was admitted through the emergency department because of progressive dyspnea. A giant intrathoracic meningocele was already diagnosed earlier but was left untreated because the patient was asymptomatic at that time. She now had dyspnea, and on chest x-ray and CT scan, there was an obvious shift of the mediastinum to the right. Because of the long-existing hemithoracic meningocele, we assumed that this patient actually had only 1 functional lung, and so, left-sided thoracotomy with resection of the meningocele and closure of the defect included a high operative mortality. Instead, we chose to obtain a permanent drainage of the meningocele by putting a shunt between the meningocele and the peritoneum. Postoperatively, the patient recovered well and became oxygen-independent. CONCLUSION Treatment of giant intrathoracic meningoceles in patients with progressive dyspnea can be challenging, and different options can be found in the literature. Treatment with a cystoperýtoneal shunt, as in our case, can be a less invasive alternative in patients with a high operative mortality risk. To our knowledge, this is the first report of a patient with neurofibromatosis 1 treated in this way.

Frameless Neuronavigation-Guided Endoscopic Total En-Bloc Removal of a Third Ventricular Colloid Cyst: A Case Report on Surgical Technique

A 26-year-old man was referred to our department with recurrent episodes of loss of consciousness. The radiological evaluation of the patients cranium showed a third ventricular colloid cyst with only a slight degree of obstructive hydrocephalus. The complete, en-bloc removal of the cyst was achieved by a frameless neuronavigation-guided endoscopic resection technique. The patient had an uneventful post-operative period and was discharged home on the fourth post-operative day without any neurological or psychological deficit. The surgical technique and pertinent literature are discussed with emphasis on factors that contribute to our successful total en-bloc removal of the third ventricular colloid cyst.

Treatment of cystic craniopharyngioma by endocavitary instillation of yttrium⁹⁰ radioisotope--still a valuable treatment option.

Craniopharyngiomas are a challenging pathology in neurosurgery because of their anatomic localization in the (supra)sellar region and their contact with diencephalic structures around the third ventricle. Among the different treatment modalities, stereotactic intracavitary treatment by instillation of yttrium⁹⁰ radioisotope is a minimally invasive technique of particular use in the treatment of cystic or partially cystic craniopharyngiomas. It can be performed under local anesthesia during a short hospitalization and has a long-lasting effect. This treatment can be repeated or used in combination with other treatment modalities such as microsurgery, endoscopy, conformal external radiation therapy, or stereotactic radiosurgery. Thus, this old and perhaps almost forgotten treatment option is still valuable in the treatment of cystic craniopharyngiomas.