Myeloid Sarcoma That Infiltrated a Preexisting Sebaceous Lymphadenoma in the Parotid Gland: Diagnostic Challenges and Literature Review

Figure 4

(a) The dissected neck lymph nodes were conglomerated. (b) Normal architecture of the lymph node was faded, and paracortical expansion by large neoplastic cells was noted (×40). (c) Immunohistochemical (IHC) staining of CD20 showed reactive follicles predominantly composed of B cells. (d) IHC staining of CD3 highlighted paracortical areas populated by T cells (×40). (e, f) Neoplastic cells with scant cytoplasm and irregular nuclei showed strong myeloperoxidase expression (×400).

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