PMC9282735_01
MRI findings indicative of brain metastasis. Pretreatment MRI T2-weighted image showing brain metastasis with perifocal edema in the right inferior temporal gyrus. (a) Preoperative enhanced MRI image showing brain metastasis with dissemination. (b and c) Posttreatment MRI showing shrinkage of the brain metastasis after the administration of the TKI osimertinib. (d: T2-weighted scans, e and f: enhanced MRI scan).
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F1
MRI taken at our department revealed a right temporo-occipital enhancing lesion with perifocal edema and dissemination that was indicative of brain metastasis [Figure 1]. Test conducted 1 month later after the start of osimertinib treatment improved to 75%. There has been no tumor recurrence after administration of osimertinib for 12 months [Figure 1].