IMPORTANT NOTICE: MedReason Challenge Dataset Usage Policy The MedReason Challenge Organizing Committee wishes to remind all participants of the following dataset usage policies: 1. The MedReason Challenge dataset and all released participant-facing resources are exclusively authorized for use within the MICCAI MedReason Challenge 2026. 2. All usage rights remain with the respective dataset owners, source institutions, and organizers of the MedReason Challenge. Access to released participant-facing resources does not transfer ownership or broader redistribution rights. 3. Any scientific publication utilizing the MedReason Challenge dataset or participant-facing resources outside the official challenge paper may require prior approval, additional consent, or a formal research collaboration agreement with the relevant dataset owners or source institutions, where applicable. 4. Distribution, redistribution, or sharing of the dataset in any form, including raw files, processed files, derived subsets, or downloaded participant-facing packages, is strictly prohibited and may result in revocation of access privileges and disqualification from the challenge. 5. Participants must not use private, proprietary, or non-public data in connection with the official MedReason submission. Additional private annotations to challenge data or public datasets are also not permitted. For questions regarding dataset usage, research collaboration, publication permissions, or data sharing consent, please contact the MedReason Challenge Organizing Committee at: medreason26@googlegroups.com MedReason Challenge Organizing Committee posted 04/21/2026