MR Imaging of Lumbar Root Avulsion: Report of Two Case Studies

scribed in 1960 (1), is a very rare disease because the bony pelvis provides an effective shield against external injury. Thus, pelvic ring fracture or hip dislocation (1) usually precedes lumbosacral nerve root avulsion. Isolated lumbosacral nerve root avulsion is so rare that, to the best of our knowledge, only nine cases have been reported in the English literature to date (2). The diagnostic accuracy of MR myelography for assessing brachial plexus injury is nearly equivalent to that of computed tomography (CT) myelography (3). Additionally, to the best of our knowledge, this is the first report that demonstrates MR findings of lumbosacral nerve root avulsion in the Korean literature. Here, we introduce secondary MR findings associated with lumbosacral nerve root avulsion is found that have not been introduced previously. Thus, we report on two cases to share our multimodal images and to introduce the new MR imaging findings.