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. 2026 Apr 1;17:1769065. doi: 10.3389/fimmu.2026.1769065

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Copyright © 2026 Yang, Pan, Yang, Wang, Cheng and Qi.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Panel A shows a histologic section of muscle tissue stained pink with visible myofibers and connective tissue. Panels B, C, D, and E display various immunohistochemical stains on muscle with different brown staining patterns, indicating the presence of specific proteins in muscle cells and surrounding tissue. Panel F presents a muscle section stained blue, highlighting individual muscle fibers with some visible structural variability. — Pathological Findings of Biceps Brachii Muscle Biopsy (A) Hematoxylin and eosin (HE) staining; (B) CD4-positive T lymphocyte infiltration; (C) CD8-positive T lymphocyte infiltration; (D) CD20-positive B lymphocyte infiltration; (E) Sarcolemmal MHC-I expression; (F) Abnormal staining on NADH dehydrogenase staining.