MRI and MR neurography of lumbosacral plexus in diagnosis of lower extremity radiculopathy

Abstract

Background: Electromyography (EMG) and nerve conduction studies can assist in identifying the source of dysfunction. Computed tomography (CT) or magnetic resonance imaging (MRI) can identify pelvic masses and visualize the major nerves of the plexus. The objective of this study was to assess the significance of MRI and magnetic resonance neurography (MRN) in diagnosing lumbosacral (LS) radiculopathy and to establish a correlation between the findings of these imaging techniques and the patient's medical history, physical examination, and nerve conduction study results. Methods: The present study was conducted on a sample of 30 individuals experiencing radicular pain in the lower extremities. Every patient underwent both MRI and MRN. Results: There were insignificant associations between MRI findings and clinical manifestations and electrophysiological studies.There were insignificant associations between MRN findings and clinical manifestations and electrophysiological studies. All the 6 cases with root abnormalities in MRN had a non-disc etiology.All the 6 cases with root abnormalities in MRN had a non-disc etiology. MRN showed no abnormalities in LS plexus in 24 cases. The remaining 6 cases showed root abnormalities. Nerve root compression and thickening was seen in all the six cases. Perineural edema was seen in 5 cases, and altered signal intensity was seen in 3 cases. Conclusion: MRN appears to detect LS nerve root abnormalities in a portion of patients with clinical symptoms of lower extremity radiculopathy and radiculopathy on EMG. Our finding may support the growing evidence on the utility of MRN as a useful adjunct to electrodiagnostic testing for the diagnosis of LS radiculopathy.