Final workshop agenda — September 27, Strasbourg
MedReason 2026 Workshop
Join us on September 27, 16:00–18:00 at Etoile A (U). The programme includes a keynote by Jiazhen Pan, four featured challenge presentations, the MedReason challenge overview, and the challenge awards & closing.
MedReason individual method paper track
Following many requests from participating teams, MedReason has opened an optional archival paper track for all registered teams—not only the Top 3. Accepted papers will be included in the MICCAI 2026 Springer LNCS proceedings.
We sincerely apologize for the short notice, and we warmly encourage interested teams to submit an individual paper describing their team’s work.
Why MedReason?
MedReason evaluates whether medical MLLM systems can perform clinically grounded visual question answering when the evaluation distribution shifts beyond the released development data.
The challenge builds on Med-CMR and focuses on one medical VQA task, while extending evaluation with a newly prepared hidden clinical-image distribution containing Brain MRI and Chest X-ray cases.
The central question is not only whether a model can answer correctly, but whether its reasoning remains reliable, visually grounded, and robust under domain shift.
At-a-glance challenge task
Participants build one medical multimodal system for two question formats: multiple-choice and open-ended questions grounded in medical imaging evidence.
What the system receives
One medical image, one question, and optional context depending on the case.
What the system must return
For multiple-choice questions, the system returns one option. For open-ended questions, the system returns both a reasoning_trace and a final answer.
How performance is evaluated
Official ranking is based on MCQ Accuracy, Open-ended GT, and Open-ended VA, with organizer-side evaluation on hidden public and private evaluation datasets that contribute equally to the final ranking.
Challenge timeline
The challenge follows a simple progression: registration and data release → pre-evaluation → final submission and workshop.
Launch and registration
Website and registration open on Apr 22, 2026.
Train release
Public materials and train split are released on Apr 22, 2026.
Validation release
Participant-facing validation resources open on May 15, 2026.
Pre-evaluation submission
Pre-evaluation submissions are accepted until Jul 15, 2026. New teams may submit before this date, with one organizer-side pre-evaluation opportunity per team.
Final submission
The final Docker submission deadline closed on Jul 22, 2026.
Final evaluation
The final evaluation has been completed, with challenge results to be presented during the workshop.
MICCAI workshop
Sep 27, 2026 · 16:00–18:00 at Etoile A (U), Strasbourg. View the final workshop agenda →