question: I just had a mri done and I suffer with a lot of lower back pain. My legs go out from under me its just that bad. My report said "there is a nonspecific region of adnormal marrow signal seen anteriorly within the upper sacum demonstrating homogeneous low signal on T1-weighted images and homogeneous high signal on T2- weighted images measuring 3.6cm transverse x 1.6cm craniocaudad x 2.3cm AP dimension. What does this mean?