To review general imaging techniques and anatomy relevant to lumbosacral MR neurography. To illustrate application of lumbosacral MR neurography in a variety of clinical cases of lumbosacral plexopathy,
MRI has increasingly been used to evaluate lumbosacral plexus pathology and can detect both intrinsic abnormalities of the lumbosacral plexus and extrinsic disease involving the lumbar spine,
psoas and piriformis muscles,
and adjacent structures . Clinical indications for lumbosacral MR neurography include Assessment of neural involvement by tumor. Assessment of extent of traumatic injury. Excluding a mass lesion in patients with unilateral EMG abnormalities. Confirmation of...
Findings and procedure details
Anatomy of the lumbosacral plexus The lumbosacral plexus( Fig. 1 ) consists of a lumbar plexus and a sacral plexus formed from ventral rami of the lumbosacral nerve roots .
The lumbar plexus is formed in or along the posterior aspect of the psoas muscle and consists of the ventral rami of the L1 through L4 nerve roots,
often with a minor contribution from T12. The following branches of the lumbar plexus arise laterally from the psoas: Iliohypogastric nerve. Ilioinguinal nerve....
Lumbosacral MR neurography is a valuable imaging tool to supplement clinical and electrodiagnostic assessment of lumbosacral plexus pathology.
 Robbins NM,
Magnetic resonance neurography in the diagnosis of neuropathies of the lumbosacral plexus: a pictorial review.
Clin Imaging 2016;40(6):1118-1130.  Lewis AM,
Magnetic resonance neurography in extraspinal sciatica.
Arch Neurol 2006;63(10):1469-1472.  Delaney H,
Magnetic resonance neurography of the pelvis and lumbosacral plexus.
Neuroimaging Clin N...