Guillain-Barré Syndrome and Low Back Pain: Two Cases and Literature Review.

To describe the clinical, electrophysiological, and lumbar magnetic resonance imaging (MRI) features of two cases of atypical Guillain-Barré syndrome (GBS). Methods We reported two GBS variant cases with initial and prominent symptoms of low back pain. We analysed their clinical, electrophysiological, and lumbar MRI features. Results Two patients with GBS reported low back pain as the initial and prominent symptom, which was not accompanied by limb weakness. The electrophysiological study showed abnormal F-waves in the common peroneal and tibial nerves, and acute polyradiculoneuropathy in the cauda equina. Examination of the cerebrospinal fluid (CSF) showed albuminocytologic dissociation. Serum was positive for GQ1b-IgM antibodies. Lumbar MRI showed gadolinium enhancement of the nerve roots and cauda equina. A standard regime of intravenous immunoglobulin markedly alleviated the low back pain. Conclusions Low back pain caused by GBS should be differentiated from other diseases. This initial or early prominent symptom may delay the diagnosis of GBS; therefore, it is important to conduct a detailed electrophysiological, CSF, and gadolinium-enhanced lumbar MRI analysis.