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A 1-year-old boy. Clinical symptoms: psychomotor retardation. MR image. (A). T1-weighted image, axial plane. (B) T2-weighted image, sagittal plane. (C) T1-weighted image, axial plane. Heterotopic gray matter bilaterally in parietal regions (asterisk), pachygyria, agenesis of the septum pellucidum, hypoplasia of the corpus callosum.
