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A 9-year-old boy. (A) Clinical symptoms: psychomotor retardation, epilepsy, headache, hemiparesis (MMC history). MR image. (A) T1-weighted image, axial plane. (B) T2-weighted, axial plane. Heterotopic gray matter in lateral aspect of the right lateral ventricle body, type II Arnold-Chiari malformation (asterisk).
