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Skin biopsy as an additional diagnostic tool in non-systemic vasculitic neuropathy

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Abstract

Sural nerve biopsy is considered mandatory for diagnosing non-systemic vasculitic neuropathy (NSVN). This invasive technique may be associated with unpleasant sequelae and cannot easily be repeated. Skin punch biopsy from an affected area may be a less invasive and repeatable diagnostic method. Here we assessed the potential diagnostic value of skin punch biopsies in NSVN by analyzing skin biopsies in 20 patients with sural nerve biopsy-proven NSVN and in 11 patients with non-inflammatory axonal neuropathy. As further controls, skin biopsies were studied in nine healthy volunteers. Five millimeter skin punch biopsies were taken under local anesthesia from the distal lateral calf and T cells and macrophages were quantified after immunostaining. The diagnostic sensitivity and specificity compared to sural nerve biopsy was determined using receiver operating characteristic (ROC) analysis. ROC analysis revealed that the highest sensitivity (94%) and specificity (79%) for NSVN was obtained when perivascular macrophages were quantified. Quantification of scattered T cells yielded a sensitivity and specificity of 65%. Inflammatory cells were very rare in controls. Quantification of inflammatory cells in skin biopsies may thus be a sensitive and specific additional tool for diagnosing NSVN.

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Acknowledgments

We thank H. Klüpfel and K. Stahl for technical assistance. This work was supported by intramural funds of the University of Würzburg.

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The authors declare that they have no conflict of interest.

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Correspondence to Nurcan Üçeyler.

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Üçeyler, N., Devigili, G., Toyka, K.V. et al. Skin biopsy as an additional diagnostic tool in non-systemic vasculitic neuropathy. Acta Neuropathol 120, 109–116 (2010). https://doi.org/10.1007/s00401-010-0662-5

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  • DOI: https://doi.org/10.1007/s00401-010-0662-5

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