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Illustrative case of 'evident' radiological response. A : MRI before the treatment reveals cystic brain metastasis at motor cortex. The patients suffered from transient hemiparesis at 1st Holmium-166-chitosan (Ho-166-chico) injection of 15 mCi. However, he recovered completely with steroid treatment and underwent two more Ho-166-chico therapy. B : MRI follow-up 11 months later showed significant decrease of both cyst volume and wall thickness.
