Unusual Spinal Epidural Lipomatosis and Lumbosacral Instability

Figure 1

Preoperative MR. T1-weighted axial and sagittal image showed Y sign and thin dural sac. MR-myelogram shows stop at L4-S1 levels. Sagittal T2- (left) and T1- (right) weighted MR images showing Modic type I endplate change at the L4-L5 and L5-S1 levels consisting of low signal intensity on T1 images and high signal intensity on T2 images.