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Group 3 patients. (a) T1 weighted images show the changes in brain metastatic lesions before and 3, 6, 9, 12, 18, 24, and 30 months after radiotherapy. (b) The island (yu‐yuan) sign appeared at 24 months; the high‐signal ring in T2 fluid‐attenuated inversion recovery (FLAIR) at 24 months; (c) diffusion was limited at 12 months; and (d) Cho/Cr > 2 at 36 months after brain metastasis radiotherapy.
