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Axillary lymph node biopsy from an HIgM A-T patient. (A) Lymph node biopsy with paracortical expansion (A, 20X) consisting of a mixture of small lymphocytes, plasma cells, and immunoblasts (B, 200X). Immunohistochemical staining for IgD (C) and IgM (D) demonstrate cytoplasmic staining of plasma cells and lymphocytes.
