A direct comparison of IDH1‐mutant and ‐wild‐type tumour T values found no significant differences between them, but we did, however, find that tumour‐bearing mice had significantly different brain T values than their naïve counterparts, and brain T values even differed between IDH1‐mutant and ‐wild‐type groups at high FSL. The gene discussed is IDH1; the disease is neoplasm.