The Hydrocephalus 2025 World Congress is an in-person event with limited online participation for invited speakers. Presenters are requested to attend the congress in person, with exceptions upon request. In case of non ability of presenters to attend the congress due to force majeure, virtual presentation may be considered upon request, and upon review by the organizing committee. Only a few virtual presentations may be allowed. Attendees are also expected to attend the congress in person.