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Acute lymphoblastic leukemia in a 3-year-old boy. A, Sagittal T1-weighted MR image demonstrates diffuse abnormal low signal intensity in the lumbar spine bone marrow consistent with a diffuse infiltrative process. B, Sagittal T1-weighted image of a healthy 3-year-old boy with normal higher T1 signal intensity of the vertebral body marrow relative to the intervertebral disks.
