Endoscopic Third Ventriculostomy For Hydrocephalus Research Articles

Comparison of endoscopic third ventriculostomy versus cerebrospinal fluid shunt procedures for the treatment of pediatric hydrocephalus in Taiwan.

Pediatric hydrocephalus is the most common cause of surgically treatable neurological disease in children. Controversies exist whether endoscopic third ventriculostomy (ETV) or cerebrospinal fluid (CSF) shunt placement is the most appropriate treatment for pediatric hydrocephalus. This study aimed to compare the risk of re-operation and death between the two procedures. We performed a retrospective population-based cohort study and included patients younger than 20-years-old who underwent CSF shunt or ETV for hydrocephalus from the Taiwan National Health Insurance Research Database. A total of 3,555 pediatric patients from 2004 to 2017 were selected, including 2,340 (65.8%) patients that received CSF shunt placement and 1215 (34.2%) patients that underwent ETV. The incidence of all-cause death was 3.31 per 100 person-year for CSF shunt group and 2.52 per 100 person-year for ETV group, with an adjusted hazard ratio (HR) of 0.79 (95% confidence interval [CI] = 0.66-0.94, p = 0.009). The cumulative incidence competing risk for reoperation was 31.2% forthe CSF shunt group and 26.4% forthe ETV group, with an adjusted subdistribution HR of 0.82 (95% CI = 0.70-0.96, p = 0.015). Subgroup analysis showed that ETV was beneficial for hydrocephalus coexisting with brain or spinal tumor, central nervous system infection, and intracranial hemorrhage. Our data indicates ETV is a betteroperative procedure for pediatric hydrocephalus when advanced surgical techniques and instruments are available.

Endovascular balloon usage in endoscopic third ventriculostomy for hydrocephalus during a national shortage: case series and technical note

Endoscopic third ventriculostomy (ETV) is a well-established surgical technique for treating hydrocephalus. Many providers have transitioned to utilizing the specialized Neuroballoon for the stoma dilation in ETV; however, these devices are intermittently unavailable during supply chain shortages. We present the experience of employing cardiac angioplasty and neurovascular balloons as substitutes for the Neuroballoon in 3 patients. The scepter balloon (Microvention), priced at $1800 compared to the standard $300 Neuroballoon (Integra), proved effective, but its pliability presented technical challenges. The substantial cost differential compared to a Neuroballoon ($300) raises economic considerations. The Cardiac TREK balloon (Abbott) was similarly effective, while also being easier to manage endoscopically and cheaper at $158. These experiences support the viability of non-neuroendoscopic specialized balloons as alternatives for ETV dilation of the floor of tuber cinereum.

Endoscopic third ventriculostomy for hydrocephalus after craniovertebral decompression for Chiari malformation type I: technical nuances and surgical pitfalls.

Hydrocephalus after craniovertebral decompression (CVD) for Chiari I malformation (CM-1) is a well-recognised complication. The mainstay of management involves medical management with high-dose steroids and/or acetazolamide, repeated lumbar punctures, external ventricular drainage (EVD) or insertion of a ventriculoperitoneal shunt (VPS). Endoscopic third ventriculostomy (ETV) has only been used a handful of times to treat this type of hydrocephalus with controversial outcomes. Not much is known about this or the technical nuances of this procedure. We report our experience. All children who underwent ETV to treat hydrocephalus post CVD done for CM-1 were identified from a prospectively kept database. Three children were identified (13F, 11F, 13F). The average time to presentation of hydrocephalus was 8days after craniovertebral decompression. Two were successfully treated with ETV with brain imaging showing a reduction in the size of the ventricles post-operatively and not requiring any further cerebrospinal fluid drainage. In one patient, the procedure had to be abandoned after the peel away catheter was introduced into the right ventricle because CSF egressed under high pressure with ventricle walls collapse resulting in an obstructed view. This child ultimately required a VPS. ETV can be used to successfully treat post CVD hydrocephalus in CM-1 patients depending on the aetiology of the hydrocephalus. There are technical and anatomical commonalities between these cases which make it more challenging than an ETV performed in "typical" obstructive hydrocephalus. We describe our experience and review the cases previously reported in the literature.

Chronic Hydrocephalus and Tethered Cord Masquerading as Postconcussive Syndrome

We present a rare case of chronic hydrocephalus and tethered cord syndrome in a high-functioning asymptomatic college student. Her presentation was triggered by a fall, at which time, she developed subacute symptoms consistent with progressive increased intracranial pressure. After endoscopic third ventriculostomy for hydrocephalus, the patient presented with progressive bilateral lower extremity and sphincter symptoms, leading to spinal imaging and diagnosis of tethered cord syndrome with fatty filum. The patient was treated with tethered cord release and had a favorable long-term outcome. This case highlights the innocuous onset of 2 congenital diagnoses in adulthood seemingly associated with a mild traumatic injury. Furthermore, it shows classic imaging findings associated with chronic increased intracranial pressure, aqueductal stenosis, and tethered cord syndrome (preoperative and postoperative appearances), which serve an important educational role given the relate rarity of these coexisting diseases in adults.

Prevalence and Pattern of Initial Complications Following Endoscopic Third Ventriculostomy for Hydrocephalus Obstructor

Objective: The purpose of this study is to analyse the complication rate of endoscopic third ventriculostomy for obstructive hydrocephalus. Study Design: Descriptive study Place and Duration: This descriptive study was conducted at Dow International Medical College and Hospital OJHA Campus, Karachi in the period from May, 2022 to October, 2022. Methods: Total 97 male and female patients aged 1-30 presented. Patients had obstructive hydrocephalus were included. With consent, all patients provided age, sex, and BMI. CT and brain MRI were performed. In all reported instances, a third ventriculostomy was done under general anaesthesia after symptoms had become apparent. Two-week follow-up examined post-treatment efficacy and complications. SPSS 26.0 analyzed all data. Results: 66 (68.04%) of the 97 patients were male, while 31(31.96%) were female. The most frequent illness was aqueductal stenosis, which was seen in 64 (65.97%), followed by posterior fossa tumours in 15 (15.5%), blocked VP shunts in 13 (13.4%), and CSF ascites in 5 (5.2%) instances. Frequency of complication was found in 22 (22.7%) cases, most prevalent was CSF leak, followed by meningitis, seizures and bleeding. There were 3 deaths (3.1%) among all cases. Conclusion: In this research, we found that endoscopic third ventriculostomy reduced the risk of complications and death for patients with obstructive hydrocephalus. Keywords: Obstructive Hydrocephalus, Complications, Endoscopic Third Ventriculostomy, Mortality

Utility of Serial Optic Nerve Sheath Diameter Measurements in Patients Undergoing Cerebral Spinal Fluid Diversion Procedures for Hydrocephalus

Functional status of cerebrospinal fluid (CSF) diversion procedure for hydrocephalus is difficult to assess on several occasions. We report the use of serial ultrasonographic measurement of optic nerve sheath diameter (ONSD) to assess the functional status of CSF diversion procedures in patients with hydrocephalus. In this prospective observational study, ultrasonographic ONSD measurement was performed preoperatively, on postoperative days 1, 3, and 7 (n= 51 at each time point) and at follow-up (n= 31) in patients undergoing ventriculoperitoneal shunt or endoscopic third ventriculostomy for hydrocephalus. Change in ONSD values during first week after CSF diversion procedure and at follow-up were correlated with ventriculoperitoneal shunt/ETV function. ONSD ≥5.5 mm strongly correlated with clinical and imaging features of raised ICP (P < 0.001). Mean ONSD progressively decreased in the postoperative period and was the lowest on postoperative day 7 (P < 0.001) with >95% of patients having ONSD <5.5 mm at that time point. At follow-up (median, 12 months; n= 31), ONSD had further reduced in 78.6% of patients. All 3 patients with shunt dysfunction had an increase in the ONSD value compared with that on postoperative day7. ONSD measurement on postoperative day 7 after CSF diversion correlates well with early surgical outcome but decreases further in many patients at a follow-up of 12 months. Rise in postoperative day 7 ONSD at follow-up correlates with failure of the CSF diversion procedure.

Endoscopic Third Ventriculostomy for Hydrocephalus in Paediatrics

Background: Abnormal CSF accumulation within ventricles of brain leading to raised intracranial pressure is a potentially life-threatening state that is commonly seen in neurosurgical patients. Aim of this study is to assess the efficacy of endoscopic third ventriculostomy (ETV) in treatment of pediatric hydrocephalus in pediatrics. Materials and Methods: A total of sixty-two patients were included in this prospective study. Patients were generally discharged from the hospital on the 2nd or 3rd postoperative day unless some complication arose. All the information was recorded in a pre-structured proforma, and data were analyzed by SPSS. Statistical significance was defined as p-value less than or equal to 0.05. Results: At follow up, clinical improvement and radiological findings did not necessarily correlate with each other, as ventricular size was reduced in only 42 (67.7%) out of 62 patients. Remaining 20 (32.3%) patients had no change in the size of ventricles. The difference was not statistically significant. However, as observed by cine PC MRI, CSF flow was observed in all the patients. Conclusion: In non-communicating hydrocephalus, ETV is a simple technique and safe and effective treatment if done by an expert surgeon correctly. It is a reasonable alternate of VPS due to its simplicity and effectiveness.

Endoscopic Third Ventriculostomy for Hydrocephalus in Infants: A Single-center Experience.

Introduction:Hydrocephalus remains one of the more common pathologies managed in pediatric neurosurgery. Endoscopic third ventriculostomy (ETV) has become the procedure of choice for the treatment of hydrocephalus due to aqueductal stenosis with high success rate. It has an advantage over ventriculoperitoneal (VP) shunting, as it enables patients to remain device free.Objective:The purpose of this study is to assess the role of ETV in the treatment of hydrocephalus in children under 1 year of age, including preterm low birth weight infants.Materials and Methods:A prospective study of 30 infants undergoing ETV in our institution between January 2014 and December 2018 was carried out. There were 25 cases of congenital hydrocephalus with aqueductal stenosis, two cases of Dandy–Walker cyst, two cases of cerebellopontine angle arachnoid cyst, and one case of posttubercular meningitis. ETV success score was calculated preoperatively to evaluate the percentage of success of ETV.Results:The overall success rate was 76.66% (23), with highest success rate of 84% in aqueductal stenosis. The mean age was 6.75 months (range: 1.5–12 months). Five infants were born preterm, four of them required a permanent VP shunt. There were two cases of intraoperative bleeding, four cases of cerebrospinal fluid leak from the wound, and one case of meningitis.Conclusion:ETV can be considered a safe and effective modality for the initial treatment of hydrocephalus in full-term normal birth weight infants, while the success of ETV in preterm low birth weight infants need further study of maturity at birth and birth weight as the determinant factors for the success of ETV in this special group.

Endoscopic third ventriculostomy for hydrocephalus: a study of thirty cases

Background: Raised intracranial pressure because of abnormal accumulation of CSF with in the ventricles of brain is a potentially life-threatening condition. Ventriculoperitoneal shunt remains mainstay of treatment even today. However, shunt failure is not uncommon. Hence endoscopic procedures are now gaining popularity. The outcome of ETV with respect to age ,etiology and long-term outcome needs further elucidation.Methods: Thirty patients with hydrocephalus who underwent endoscopic treatment were analysed retrospectively with respect to age, diagnosis, surgical outcome, treatment failure and complications.Results: Total of 28 patients successfully underwent ETV and with an overall success rate of 78%. Moreover, the success rate of ETV was found to be 100% in the 0-1 and 80% in 1-2 years age groups. 2 patients required re operation in the form of VP shunt.Conclusions: ETV is a safe and effective surgical modality with comparable outcome in paediatric and adult populations.

The effect and evolution of patient selection on outcomes in endoscopic third ventriculostomy for hydrocephalus: A large-scale review of the literature

Endoscopic third ventriculostomy (ETV) has become a popular technique for the treatment of hydrocephalus, but small sample size has limited the generalizability of prior studies. We performed a large-scale review of all available studies to help eliminate bias and determine how outcomes have changed and been influenced by patient selection over time. A systematic literature search was performed for studies of ETV that contained original, extractable patient data, and a meta-analytic model was generated for correlative and predictive analysis. A total of 130 studies were identified, which included 11,952 cases. Brain tumor or cyst was the most common hydrocephalus etiology, but high-risk etiologies, post-infectious or post-hemorrhagic hydrocephalus, accounted for 18.4%. Post-operative mortality was very low (0.2%) and morbidity was only slightly higher in developing than in industrialized countries. The rate of ETV failure was 34.7% and was higher in the first months and plateaued around 20months. As anticipated, ETV is less successful in high-risk etiologies of hydrocephalus and younger patients. Younger patient age and high-risk etiologies predicted failure. ETVs were performed more often in high-risk etiologies over time, but, surprisingly, there was no overall change in ETV success rate over time. This study should help to influence optimal patient selection and offer guidance in predicting outcomes.

Visual outcome after endoscopic third ventriculostomy for hydrocephalus

Hydrocephalus-related symptoms are mostly improved after successful endoscopic third ventriculostomy (ETV). However, visual symptoms can be different. This study was focused on visual symptoms. We analyzed the magnetic resonance images (MRI) of the orbit and visual outcomes. From August 2006 to November 2016, 50 patients with hydrocephalus underwent ETV. The male-to-female ratio was 33:17, and the median age was 61years (range, 5-74years). There were 18 pediatric and 32 adult patients. Abnormal orbital MRI findings included prominent subarachnoid space around the optic nerves and vertical tortuosity of the optic nerves. We retrospectively analyzed clinical symptoms, causes of hydrocephalus, ETV success score (ETVSS), ETV success rate, ETV complications, orbital MRI findings, and visual impairment score (VIS). The median duration of follow-up was 59months (range, 3-113months). The most common symptoms were headache, vomiting, and gait disturbance. Visual symptoms were found in 6 patients (12%). The most common causes of hydrocephalus were posterior fossa tumor in 13 patients, pineal tumor in 12, aqueductal stenosis in 8, thalamic malignant glioma in 7, and tectal glioma in 4. ETVSS was 70 in 3 patients, 80 in 34 patients, and 90 in 13 patients. ETV success rate was 80%. ETVSS 70 showed the trend in short-term survival compared to ETVSS 90 and 80. ETV complications included epidural hematoma requiring operation in one patient, transient hemiparesis in two patients, and infection in two patients. Preoperative abnormal orbital MRI findings were found in 18 patients and postoperative findings in 7 patients. Four of six patients with visual symptoms had abnormal MR findings. Three patients did not show VIS improvement, including two with severe visual symptoms. Patients with severe visual impairment were found to have bad outcomes. The visual symptoms related with increased intracranial pressure should be carefully monitored and controlled to improve outcomes.

Result of Endoscopic Third Ventriculostomy for Hydrocephalus Caused by Cerebral Aqueductal Stenosis in Infant Patients

Background Endoscopic third ventriculostomy (ETV) is one of the important management options for hydrocephalus, especially obstructive hydrocephalus. The result of ETV in different age and etiology is quite variable according to the different authors. The study was carried out to assess the success rate of ETV as a treatment for this type of hydrocephalus in infant age group. Material and Methods The study was done prospectively on infants (age ≤ 12 months) admitted in the period from January 2009 to June 2013 suffering from obstructive hydrocephalus due to cerebral aqueductal stenosis (CAS). After making the diagnosis, we counseled the patient party about the probability of high failure rate of ETV in this age group and probable necessity of a second operation. With the informed consent, we performed ETV in these cases and followed up regularly in postoperative period. Control neuroimaging studies were done whenever needed (suspected failure of ETV and suspected stomal block). Results Total 17 infants were studied. Average follow-up was 18.7 months. Twelve infants were between the age group of six and under six months while five were above six months to one year old. Fourteen (82.35%) out of 17 patients showed overall clinical improvement. Clinical improvement was seen in two (66.6%) infants aged 2 months or younger, three (75%) aged 2+ to 3 months, five (100%) aged 3+ to 6 months, and four (80%) aged 6+ months to 1 year. Two patients had bleeding during surgery. Three developed CSF leak through the burr hole. In one case (the patient's age was 2 months), the stoma was found blocked, and hydrocephalus returned 9 weeks after ETV. In two patients, in whom VP shunt was needed, “failed ETV” was obvious in early postoperative period. In this series, average ETV success score (ETVSS) was 52.35 (range: 40–70) and overall success rate was 82.35%. This indicates that ETVSS does not correlate with the outcome of ETV in infants with CAS. Conclusion Outcome of ETV for hydrocephalus from CAS in infant is quite good and ETVSS does not correlate with the outcome.

Endoscopic third ventriculostomy for hydrocephalus in brainstem glioma: a case series

A brainstem glioma is an incurable brain tumor that can be complicated by hydrocephalus. A ventriculoperitoneal (VP) shunt is generally performed for the control of hydrocephalus. This study aimed to reveal the safety and efficacy of an endoscopic third ventriculostomy (ETV) for hydrocephalus in brainstem gliomas. Six patients who had pontine glioma with hydrocephalus underwent an ETV between May 2010 and November 2015. In all the cases, there were one or more symptoms of hydrocephalus (headache, nausea, vomiting, or lethargy). Retrospective review of these patients was performed using the medical records and neuroimagings. The ETV was performed safely and there were no intraoperative complications in all patients. The mean follow-up period was 12.3months. An immediate symptomatic relief of hydrocephalus and an adequate control of symptoms were achieved without a VP shunt in all patients. The ETV is considered to be an effective and safe procedure for the treatment of hydrocephalus in brainstem gliomas. Determining the ventriculostomy site according to the preoperative MRI in each case is considered to be important for the safe procedure.

Complications of endoscopic third ventriculostomy for hydrocephalus

To explore the complications of endoscopic third ventriculostomy (ETV) for hydrocephalus and examine their preventions. From September 2008 to September 2013, ETV was offered for obstructive hydrocephalus (n=15) and communicating hydrocephalus (n=5). And the prevention and treatment of common complications were analyzed. All had achieved satisfactory outcomes. For 16 cases, their symptoms and signs disappeared, ventricle returned to normal and interstitial edema resolved; for another 4 cases, there were improvements of symptoms and (or) signs, ventricular shrinking and/or interstitial edema lessening. And the postoperative complications included fever (n=5), poor healing of incision (n=2), scalp hydrops (n=2) and intracranial infection (n=1). The indications of ETV should be selected strictly according to the specific anatomical characteristics of bottom of third ventricle. And individualized methods of stoma are necessary. And early postoperative lumbar puncture and drainage may obviously reduce complications and improve surgical outcomes.

The treatment of endoscopic third ventriculostomy for hydrocephalus caused by tectal plate gliomas

Methods Preoperative MRI prompted that there were tegmental region masses in 13 children with hydrocephalus. The increase was not obvious. The fiber neuroendoscopy was used for the endoscopic third ventriculostomy. During the operative observation of mesencephalon tegmental region, the hyperplasia of periaqueductal nerve tissue with light pink rough surface and the occlusive aqueduct opening could be observed.

ET-03 * CAVITATION-BASED THIRD VENTRICULOSTOMY USING MRI-GUIDED FOCUSED ULTRASOUND

Transcranial focused ultrasound is increasingly being investigated as a minimally invasive treatment for a range of intracranial pathologies. At higher peak rarefaction pressures than those used for thermal ablation, focused ultrasound can initiate inertial cavitation and create holes in the brain by fractionation of the tissue elements. We investigated the technical feasibility of using MRI-guided focused ultrasound to perform a third ventriculostomy as a possible noninvasive alternative to endoscopic third ventriculostomy for hydrocephalus. A craniectomy was performed in male pigs weighing 13-19 kg to expose the supratentorial brain, leaving the dura mater intact. Seven pigs were treated through the craniectomy, while 2 pigs were treated through ex vivo human skulls placed in the beam path. Registration and targeting was done using T2-weighted MRI sequences. For transcranial treatments a CT scan was used to correct the beam from aberrations due to the skull and maintain a small, high-intensity focus. Sonications were performed at both 650 kHz and 230 kHz at a range of intensities, and the in situ pressures were estimated both from simulations and experimental data to establish a threshold for tissue fractionation in the brain. In craniectomized animals at 650 kHz, a peak pressure 3 22.7 MPa for 1 second was needed to reliably create a ventriculostomy. Transcranially at this frequency the ExAblate 4000 was unable to generate the required intensity to fractionate tissue, although cavitation was initiated. At 230 kHz, ventriculostomy was successful through the skull with a peak pressure of 8.8 MPa. This is the first study to suggest that it is possible to perform a completely noninvasive third ventriculostomy using ultrasound. This may pave the way for future studies and eventually provide an alternative, non-invasive means for the creation of CSF communications in the brain, including perforation of the septum pellucidum or intraventricular membranes.

Endoscopic third ventriculostomy for hydrocephalus due to tectal glioma.

Tectal gliomas commonly present with hydrocephalus from obstruction of the aqueduct of Sylvius. The creation of a ventriculostomy in the floor of the third ventricle (ETV) has been previously reported to by-pass aqueduct obstruction. The goal of this study was to determine the safety and efficacy of ETV in the presence of an obstructing tectal glioma. We retrospectively reviewed the clinical presentation, management, and clinical outcome after ETV in patients diagnosed with tectal glioma and obstructive hydrocephalus in our institution over a period of 15 years. Shunt freedom at follow-up was the main outcome variable. Long-term clinical outcome was assessed at the most recent clinic visit. Clinical outcome was ranked as excellent, good, or poor according to resolution of symptoms and patient functional status. The median age at presentation was 16.5 years (range: 6.4 to 59 years) and the most common presenting symptom was headache. Eleven patients had ETV as a primary procedure and three patients underwent ETV as a substitute for shunt revision at the time of shunt failure. At follow-up (median 3.9 years, range: 2.2 to 7 years) 13 of 14 patients remain shunt independent with excellent (n=9) or good outcomes (n=5). In patients with tectal glioma causing obstructive hydrocephalus, ETV can be performed safely in the primary setting or as a substitute for shunt revision. A high rate of shunt freedom (78%-100%) at prolonged follow-up can be expected in this patient population.

Cavitation-based third ventriculostomy using MRI-guided focused ultrasound

Transcranial focused ultrasound is increasingly being investigated as a minimally invasive treatment for a range of intracranial pathologies. At higher peak rarefaction pressures than those used for thermal ablation, focused ultrasound can initiate inertial cavitation and create holes in the brain by fractionation of the tissue elements. The authors investigated the technical feasibility of using MRI-guided focused ultrasound to perform a third ventriculostomy as a possible noninvasive alternative to endoscopic third ventriculostomy for hydrocephalus. A craniectomy was performed in male pigs weighing 13-19 kg to expose the supratentorial brain, leaving the dura mater intact. Seven pigs were treated through the craniectomy, while 2 pigs were treated through ex vivo human skulls placed in the beam path. Registration and targeting was done using T2-weighted MRI sequences. For transcranial treatments a CT scan was used to correct the beam from aberrations due to the skull and maintain a small, high-intensity focus. Sonications were performed at both 650 kHz and 230 kHz at a range of intensities, and the in situ pressures were estimated both from simulations and experimental data to establish a threshold for tissue fractionation in the brain. In craniectomized animals at 650 kHz, a peak pressure ≥ 22.7 MPa for 1 second was needed to reliably create a ventriculostomy. Transcranially at this frequency the ExAblate 4000 was unable to generate the required intensity to fractionate tissue, although cavitation was initiated. At 230 kHz, ventriculostomy was successful through the skull with a peak pressure of 8.8 MPa. This is the first study to suggest that it is possible to perform a completely noninvasive third ventriculostomy using ultrasound. This may pave the way for future studies and eventually provide an alternative means for the creation of CSF communications in the brain, including perforation of the septum pellucidum or intraventricular membranes.

Endoscopic Third Ventriculostomy for Hydrocephalus Due to Unruptured Pineal AVM: Case Report and Review of the Literature

Arteriovenous malformations (AVM) are considered to be static congenital lesions; however, a subset may possess dynamic pathophysiological capabilities of growth, regression or other morphological changes with time. We report on an adult patient harboring a pineal AVM who presented with progressive symptoms of obstructive hydrocephalus and was successfully treated by endoscopic third ventriculostomy (ETV). This 63-year-old man was incidentally diagnosed 8 years previously with an asymptomatic unruptured pineal AVM and followed conservatively until he developed a progressive impairment in consciousness with gait apraxia and incontinence over a period of 2 months. Magnetic resonance imaging (MRI) revealed obstructive hydrocephalus due to nidal compression at the level of the aqueduct. Treatment by ETV resulted in resolution of neurological deficits and ventriculomegaly without evidence of complications at 18-months follow-up. Treatment by ETV in adults with obstructive hydrocephalus due to deep pineal AVMs is a reasonable option in selected cases. A discussion of the pathological mechanisms and therapeutic options for this rare entity is presented.

Long-term change in ventricular size following endoscopic third ventriculostomy for hydrocephalus due to tectal plate gliomas

Endoscopic third ventriculostomy (ETV) is an alternative to shunt placement in children with hydrocephalus due to tectal plate gliomas (TPGs). However, controversy remains regarding the amount of ventricular size reduction that should be expected after ETV. This study investigates ventricular size change after ETV for TPGs. Twenty-two children were identified from a 15-year retrospective database of neuroendoscopic procedures performed at the authors' institution, Children's Hospital of Alabama, in patients with a minimum of 1 year of follow-up. Clinical outcomes, including the need for further CSF diversion and symptom resolution, were recorded. The frontal and occipital horn ratio (FOR) was measured on pre- and postoperative, 1-year, and last follow-up imaging studies. In 17 (77%) of 22 children no additional procedure for CSF diversion was required. Of those in whom CSF diversion failed, 4 underwent successful repeat ETV and 1 required shunt replacement. Therefore, in 21 (96%) of 22 patients, CSF diversion was accomplished with ETV. Preoperative and postoperative imaging was available for 18 (82%) of 22 patients. The FOR decreased in 89% of children who underwent ETV. The FOR progressively decreased 1.7%, 11.2%, and 12.7% on the initial postoperative, 1-year, and last follow-up images, respectively. The mean radiological follow-up duration for 18 patients was 5.4 years. When ETV failed, the FOR increased at the time of failure in all patients. Failure occurred 1.6 years after initial ETV on average. The mean clinical follow-up period for all 22 patients was 5.3 years. In all cases clinical improvement was demonstrated at the last follow-up. Endoscopic third ventriculostomy successfully treated hydrocephalus in the extended follow-up period of patients with TPGs. The most significant reduction in ventricular size was observed at the the 1-year followup, with only modest reduction thereafter.