# Long-term outcome of cerebrospinal fluid diversion in patients with intracranial germinoma at Ramathibodi Hospital

## TL;DR

This study compares the long-term success of two cerebrospinal fluid diversion methods in patients with intracranial germinoma and finds endoscopic third ventriculostomy to be more effective and safer.

## Contribution

The study provides novel evidence on the long-term outcomes of cerebrospinal fluid diversion methods in intracranial germinoma patients.

## Key findings

- Endoscopic third ventriculostomy (ETV) achieved 100% success without complications in 22 patients.
- Ventriculoperitoneal shunts required revisions in 9.5% of cases due to blockage or over-drainage.
- All patients remained alive without metastases and maintained good quality of life.

## Abstract

Intracranial germinoma has a favorable prognosis with modern therapies, but the long-term outcome of cerebrospinal fluid (CSF) diversion for its associated hydrocephalus has been rarely focused on.

To evaluate the long-term success of CSF diversion methods—endoscopic third ventriculostomy (ETV) versus ventriculoperitoneal (VP) shunt—in intracranial germinoma patients.

Only pure intracranial germinomas with obstructive hydrocephalus and a minimum follow-up duration of 24 months were retrospectively reviewed. Their demographics, as well as pre-and postoperative data, were recorded. Patients were stratified into the ETV and the non-ETV groups and subsequently compared to determine the longevity and morbidity related to the procedures. Factors associated with the failure of CSF diversion were examined.

From 1993 to 2022, eighty-three pathologically confirmed intracranial germinomas were identified. Excluding four cases of mixed pathology, eight with incomplete data, and two with insufficient follow-up, we enrolled 69 eligible patients for analysis. Among them, forty-three cases with obstructive hydrocephalus were classified into the ETV (n = 22) and non-ETV (n = 21) groups. No intraoperative or immediate postoperative complications occurred. With a median follow-up of 101 months (IQR 77.75–139.75), the ETV group had no failures. In the non-ETV cohort (median follow-up 144 months (IQR 97–210)), two VP shunt cases (9.5%) required revision due to blockage, and two patients (9.5%) experienced transient over-drainage. These 4 patients were without long-term difficulty despite short-term cumbersome events. No significant factors predicting CSF diversion failure were identified. To date, all 43 patients are alive without metastases, maintaining a good quality of life.

This study highlights ETV as a preferred CSF diversion method in pure intracranial germinoma, achieving 100% success without morbidity. Apart from simultaneous biopsy, avoiding a separate operation, this approach eliminates shunt-related complications, ensuring long-term quality of life in patients with extraordinary prognoses from modern chemo- and radiotherapy.