please help! 4-5 days ago, my 18yo daughter started having bilateral pain in both legs, down backs of thighs somewhat like sciatica, however, when she stood, the pain went to her calves, to the point of her almost collapsing. Also every night charlie horses. Pain rapidly became worse as each day went by. NO TRAUMA, NO FALLS, NO TWISTS, NO SPORTS> normal lumbar xray, however today MRI SPINE: "complete fatty tissue replacement of the t11 vertebral body of indeterminate etiology...increased t1 and proton density signal and decreased signal on fat supressed t2 and inversion recoveruy images.There is no enhancement. There is a tiny area of what appears to be normal marrow at the left psoterior inferior end platein the lefter inferior aspect of the left pedicle as seen on sagittal series.....The fatty replacement involves the posterior elements as well as nearly the entire vertebral body. No expansion of the vertebral body. cortices are intact. no retropulsion...." She has NEVER been on steroids. Tomorrow the thoracic spine will have mri with and without contrast as well. PLEASE PLEASE ADVISE, AS NO ONE HAS ANY IDEAS OF ETIOLOGY, AND THE DOCTORS HAVE STATED THEY'VE NEVER SEEN THIS BEFORE.