Figure Legends:

Figure 1 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+).
Figure 2 (color)The abdominal skin lesion and the biopsy specimens of abdominal skin lesions; Left: Patient’s abdomen upon examination on follow-up two years post-presentation. The skin shows scattered violaceous telangiectasiae and retiform purpurae. Middle and Right: Sections show intravascular proliferation of atypical lymphocytic cells inside the dermis. Left: Low magnification Right: High magnification.
Supplementary Figure: The case presentation timeline.