Hello, I have a couple questions about the BraTS-PEDs 2026 dataset. **1. Longitudinal Cohort.** The challenge describes 35 post-treatment longitudinal patients (105 cases), but the batch-2 download contains only 13 patients. Where are the remaining 22 patients? Are they reserved for the hidden test set or pending a later release? **2. Metadata sharing.** No metadata files are provided for the 2026 BraTS-PEDs dataset. In the 2025 release, demographics (e.g. age, sex, ethnicity, race) were populated only for 116 training subjects and scanner/imaging info for 112 subjects, with nothing for the validation set and non tumor-type fields anywhere. Would it be possible for you to share tumor type, demographic info, and scanner/imaging info for the other subjects?

Created by Zander Giuffrida zndr27
Thank you for your interest in the dataset. 1. For the challenge purpose, all available longitudinal training data were included in Batch 2, there will be no additional release at this stage. 2. We don't currently provide metadata files containing clinical information for the 2026 datasets. Clinical information was shared for subjects in BraTS 2025, and is available through TCIA for your research purposes. https://www.cancerimagingarchive.net/collection/brats-peds/ Best regards, Zhifan
Tagging the BraTS-PEDs team: @anahita.kazerooni @zjiang @astaraki
Just following up again to get an answer

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