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

Figure 3

(a) One section of the parotid gland revealed a well-circumscribed and encapsulated tan-to-white solid mass that was seemingly close to the resection margin and measured about 3.5 cm in diameter. The cut surface of the mass showed cystic change that contained sebum-like gelatinous yellow material (asterisk). (b) Microscopically, the tumor in the parotid was composed of variable-sized sebaceous epithelial cell nests and rich lymphoid stroma (×40). (c, d) The epithelial component consisted of solid, variable-sized, and small primitive basaloid cell nests on H&E staining which were immunohistochemically positive for cytokeratin (CK) (×400).

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