Dorsal root ganglia hypertrophy as <i>in vivo</i> correlate of oxaliplatin-induced polyneuropathy Leonidas Apostolidis Daniel Schwarz Annie Xia Markus Weiler Andreas Heckel Tim Godel Sabine Heiland Heinz-Peter Schlemmer Dirk Jäger Martin Bendszus Philipp Bäumer 10.1371/journal.pone.0183845 https://plos.figshare.com/articles/dataset/Dorsal_root_ganglia_hypertrophy_as_i_in_vivo_i_correlate_of_oxaliplatin-induced_polyneuropathy/5343430 <div><p>Purpose</p><p>To investigate <i>in vivo</i> morphological and functional correlates of oxaliplatin-induced peripheral neuropathy (OXA-PNP) by magnetic resonance neurography (MRN).</p><p>Methods</p><p>Twenty patients (7 female, 13 male, 58.9±10.0 years) with mild to moderate OXA-PNP and 20 matched controls (8 female, 12 male, 55.7±15.6 years) were prospectively enrolled. All patients underwent a detailed neurophysiological examination prior to neuroimaging. A standardized imaging protocol at 3.0 Tesla included the lumbosacral plexus and both sciatic nerves and their branches using T2-weighted fat-saturated sequences and diffusion tensor imaging. Quantitative assessment included volumetry of the dorsal root ganglia (DRG), sciatic nerve normalized T2 (nT2) signal and caliber, and fractional anisotropy (FA), mean diffusivity (MD), axial (AD) and radial diffusivity (RD). Additional qualitative evaluation of sciatic, peroneal, and tibial nerves evaluated the presence, degree, and distribution of nerve lesions.</p><p>Results</p><p>DRG hypertrophy in OXA-PNP patients (207.3±47.7mm<sup>3</sup> vs. 153.0±47.1mm<sup>3</sup> in controls, p = 0.001) was found as significant morphological correlate of the sensory neuronopathy. In contrast, peripheral nerves only exhibited minor morphological alterations qualitatively. Quantitatively, sciatic nerve caliber (27.3±6.7mm<sup>2</sup> vs. 27.4±7.4mm<sup>2</sup>, p = 0.80) and nT2 signal were not significantly changed in patients (1.32±0.22 vs. 1.22±0.26, p = 0.16). AD, RD, and MD showed a non-significant decrease in patients, while FA was unchanged.</p><p>Conclusion</p><p>OXA-PNP manifests with morphological and functional correlates that can be detected <i>in vivo</i> by MRN. We report hypertrophy of the DRG that stands in contrast to experimental and postmortem studies. DRG volume should be further investigated as a biomarker in other sensory peripheral neuropathies and ganglionopathies.</p></div> 2017-08-24 17:57:37 DRG volume sciatic nerves RD Conclusion OXA-PNP manifests oxaliplatin-induced polyneuropathy Purpose 3.0 Tesla MRN nerve lesions non-significant decrease Dorsal root ganglia hypertrophy mm tibial nerves nT 2 signal Results DRG hypertrophy T 2 neurophysiological examination postmortem studies resonance neurography MD imaging protocol dorsal root ganglia FA vivo vs Quantitative assessment report hypertrophy AD diffusion tensor imaging T 2-weighted fat-saturated sequences lumbosacral plexus