Sebaceous carcinoma of the submandibular gland with high-grade malignancy: Report of a case

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A case of sebaceous carcinoma arising in the left submandibular gland of a 66-year-old man is reported. The clinical and pathological examinations revealed a carcinoma, which was of salivary gland in origin, with regional lymph nodal metastases. Pathological findings showed features of high-grade sebaceous carcinoma with spindle myoepitheliomatous differentiation. Neither squamous cell nor duct epithelial-like cell differentiation was noted. Immunohistochemically, tumor cells were positive for cytokeratin, S-100 protein and vimentin. Lipid was demonstrated in the cytoplasm of the tumor cells. Ultrastructurally, tumor cells contained numerous intracytoplasmic lipid droplets. Myoepitheliomatous differentiation is rare in sebaceous carcinoma of the salivary gland. Presented is the second reported case of sebaceous carcinoma arising in the submandibular gland.

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