A 78-year-old woman with aplastic anemia and MR evidence of foci of hypercellular marrow. T1-weighted (500/10, TR/TE) sagittal MR image of the lumbar spine shows multiple foci of dark signal (arrows) on a background of bright aplastic marrow. On enhanced MR images (not shown), the lesions enhanced. Bone marrow biopsy showed myelodysplasia.