I am a 41 year old female. I was born with a fatty tumor that was wrapped around the base of my spine. I had it removed at age 8.I very recently had an MRI done because I have been having chronic pain in my legs and lower back. the results said that there is a tethered cord with the tip of the conus medullaris reaching L4-5.Ther is an associated predominantly fatty mass from mid L3 through L4-5 in the posterior aspect of the thecal sac arising from the conus extending through a defect in the L4 and L5 posterior arches into the deep subcantaneous fat at L5 level .There is a mild fibrotic stranding in the deep subcantaneous fat. however no additional significant mass lesion.Longitudinal span of the mass is 4.5 cm however an additional thin component extends through the spinal dysraphism. additional dimensions are 14 mm transversely and 9mm anteroposterlorly at the L3-4 level. There is a 5 mm retrolisthesis at L5-S1 .there is moderate exaggeration of the lumbosacral lordotic curve fromL4 through S1.vertebral heights appear generally maintained. disc degeneration is mild at L4-5 and L5-S1 with dehydration.no worrisome marrow replacing lesions are seen. the abdominal aorta is unremarkable. no retroperitoneal lymphadenopathy.