Magnetic resonance imaging at 4 years. a T2-weighted image shows significant volume loss in bilateral white matter and deep gray matter as a cause of enlargement of the anterior horn of the lateral ventricle. b1,2 T1-weighted image and T2-weighted image show the periventricular rim around the posterior horn of the lateral ventricle. c Abnormal signals in the medulla oblongata become apparent in T2-weighted image.