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Histopathologic assessment of peroneal nerve biopsy; sections show unremarkable nerve bundles. Adjacent vessels are stuffed with large pleomorphic lymphoid cells. Cells have a high N/C ratio and hyperchromatic nuclei, and scant cytoplasm. Immunohistochemical (IHC) staining shows positive reactivity for CD20, and the diagnosis was reported as intravascular large B‐cell lymphoma(CD20+).
