Endoscopic Third Ventriculostomy and Pineal Biopsy from a Single Entry Point
June 28th, 2024
Pineal neoplasms frequently cause obstructive hydrocephalus and require histopathological diagnosis to decide the treatment regimen. They might be treated by surgical resection or chemoradiotherapy according to the pathological diagnosis. As a minimally invasive initial treatment, an endoscopic approach from Kocher's point enables both third ventriculostomy and biopsy.
Endoscopic intraventricular approach are widely used in neurosurgery. Here we describe the full endoscopic technique for third ventriculostomy and pineal biopsy from a single entry point in patient that had obstructive hydrocephalus due to pineal lesions. So endoscopic systems contains bone marrow channel and one irrigation channel.
Bipolar coagulation, nerve balloon, and microforceps are sufficient for the procedure. The advent of advanced technology has enabled the acquisition of high definition HCN for quality images during endoscopic surgeries. Angled and flexible endoscope facilitate more effective work in smaller areas, enhancing the precision and efficiency of surgical procedures.
To begin, insert the 6.1 millimeter wide endoscope into the endoscope sheath, which is already inserted into the lateral ventricular cavity. Identify the septal and thalamostriate veins. Identify and follow the choroid plexus anteriorly up to the third ventricle through the foramen of Monroe, or FOM.
Pass the ventricular scope through the FOM to access the third ventricle. To find the floor of the third ventricle, which is usually thin due to hydrocephalus, identify the mammillary bodies and infundibular recess in the third ventricle. Ensure that the hole at the base of the third ventricle is located at the most translucent point between the infundibular recess and the mammillary bodies.
Use the tip of the four French Fogarty catheter to puncture the base of the third ventricle, then repeatedly inflate and deflate the balloon of the catheter to widen the opening. See the jet flow of CSF when the catheter balloon is deflated. Move the endoscope to the posterior region of the third ventricle, where the pineal gland tumor is located.
Identify the massa intermedia to allow better visualization of the posterior third ventricle. Perform dissection and identify the tumor to examine its growth pattern before carefully coagulating the surface of the tumor using bipolar cautery. After complete coagulation of the tumor surface, take a biopsy using biopsy forceps.
Resect the tumor according to the histopathological diagnosis. Control local hemorrhage with irrigation and bipolar cautery. Remove the endoscopic system before closing the wound with sutures without a drain.
Overview
This article discusses the endoscopic technique for third ventriculostomy and pineal biopsy in patients with obstructive hydrocephalus due to pineal lesions. The procedure is performed through a single entry point, utilizing advanced endoscopic systems for enhanced precision.
Key Study Components
Area of Science
- Neurosurgery
- Endoscopic techniques
- Pineal neoplasms
Background
- Pineal neoplasms can lead to obstructive hydrocephalus.
- Histopathological diagnosis is crucial for treatment decisions.
- Surgical resection or chemoradiotherapy may be required based on diagnosis.
- An endoscopic approach offers a minimally invasive treatment option.
Purpose of Study
- To describe the full endoscopic technique for third ventriculostomy.
- To demonstrate the biopsy procedure for pineal lesions.
- To highlight the advantages of using a single entry point.
Methods Used
- Endoscopic intraventricular approach.
- Use of bipolar coagulation, nerve balloon, and microforceps.
- High definition imaging for enhanced visualization.
- Angled and flexible endoscopes for precision in small areas.
Main Results
- The endoscopic technique effectively addresses obstructive hydrocephalus.
- Single entry point allows for both third ventriculostomy and biopsy.
- Advanced technology improves surgical outcomes.
- Enhanced precision and efficiency in procedures.
Conclusions
- The endoscopic approach is a viable initial treatment for pineal neoplasms.
- It minimizes invasiveness while providing necessary diagnostic information.
- Further studies may enhance understanding of its long-term efficacy.
Frequently Asked Questions
Executive Industry Relevance
Rapid, minimally invasive tissue diagnosis is critical for pediatric pineal neoplasms, where treatment selection depends on accurate histopathological data and immediate management of obstructive hydrocephalus. The described endoscopic technique enables simultaneous cerebrospinal fluid diversion and tumor biopsy from a single entry, streamlining workflow and reducing procedural risk. This dual-function approach supports timely, evidence-based decision-making at a pivotal inflection point in neuro-oncology pipelines.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables acquisition of high-integrity tissue samples for molecular and histopathological target validation.
- Supports mechanistic de-risking by correlating clinical presentation with tumor biology.
- Facilitates rapid hypothesis testing regarding tumor classification and treatment response predictors.
Screening & Assay Development
- Provides validated biopsy material for downstream assay development and biomarker discovery.
- Ensures reproducibility and standardization in sample collection for translational research.
- Improves screening readiness by integrating diagnostic and therapeutic interventions in a single workflow.
Translational & Preclinical Research
- Aligns tissue acquisition with disease-relevant model development for preclinical studies.
- Enables continuity from clinical diagnosis to translational biomarker validation.
- Reduces biological ambiguity, supporting risk-adjusted advancement of therapeutic candidates.
Pipeline & Workflow Integration
This endoscopic method bridges acute clinical intervention and research sample acquisition, positioning it at the interface of diagnostic discovery and translational pipeline entry.
- Discovery Biology: Supports hypothesis-driven tissue sampling for mechanistic studies and target validation.
- Screening: Delivers standardized, high-quality samples for assay development and comparative analytics.
- Analytics: Enables quantitative histopathological and molecular measurements to inform downstream decisions.
- Translational Research: Provides continuity from patient diagnosis to preclinical model alignment and biomarker exploration.
- Enterprise Reuse: Establishes a reproducible, minimally invasive platform for future neuro-oncology research and sample collection.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence in target validation and reduces mechanistic uncertainty.
- Operational Value: Streamlines sample acquisition, standardizes procedures, and enhances reproducibility.
- Strategic Value: Accelerates go/no-go decisions and optimizes resource allocation by integrating diagnosis and intervention.
- Portfolio Impact: Supports risk-adjusted prioritization and advancement of neuro-oncology assets.
Implementation Considerations
- Requires specialized neurosurgical expertise and training in endoscopic techniques.
- Demands access to advanced endoscopic instrumentation and high-definition imaging systems.
- Necessitates cross-team standardization for sample handling and data integration.
- Adaptation may be needed for different tumor locations or patient populations.
- Potential limitations include anatomical variability and procedural learning curve.
