Intraventricular Medication with or without Ventricular Shunt for Leptomeningeal Metastases with Different Intracranial Pressure: A Single-Center, Large-Scale Retrospective Study.

Objective: To evaluate the efficacy and prognosis of intraventricular medication (IVM) administered via the reservoir of Ommaya or ventricular shunt (VS) system to control leptomeningeal metastases, with or without VS based on intracranial pressure, in combination with postoperative systemic therapy.

Methods: Between April 2021 and December 2022, 125 patients with leptomeningeal metastases were managed in our department who underwent Ommaya reservoir placement and/or VS and subsequently received IVM postoperatively. The extent of symptom amelioration and survival, as well as the determinants influencing prognosis, were evaluated.