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Salivary Duct Carcinoma of the Parotid Gland Originating from an Epithelial-Myoepithelial Carcinoma: Report of a Rare Case

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Abstract

Salivary duct carcinoma (SDC) is a high-grade carcinoma with poor prognosis, especially among various salivary carcinomas. In this study, we report a rare case of SDC of the parotid gland originating from an epithelial-myoepithelial carcinoma (EMC). A 71-year-old Japanese man presented with swelling of the right parotid region and a right facial nerve paralysis for 10 months. He underwent extended total parotidectomy and chemoradiotherapy after the surgery. Histologically, a major part of the tumor was an androgen receptor (AR)-positive, human epidermal growth factor receptor 2 (HER2)-positive, gross cystic disease fluid protein-15 (GCDFP-15)-positive SDC, with a focus of a typical EMC component at the periphery of the lesion. In the transitional area of the two components, inner ductal cells of double-layered ducts showed similar morphology and immunophenotype to SDC. These findings suggest that SDC originated from the inner ductal cells of EMC. Because the tumor included an EMC as a low-grade carcinoma and an SDC as a high-grade carcinoma, we can consider our case as a dedifferentiated carcinoma as well as a hybrid tumor.

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Acknowledgements

The authors thank all medical technologists (Osaka International Cancer Institute) for their technical assistance and Editage (http://www.editage.jp) for English language editing. No funding obtained.

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Correspondence to Shin-ichi Nakatsuka.

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The authors declare that they have no conflict of interest.

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Hamamoto, Y., Harada, H., Suzuki, M. et al. Salivary Duct Carcinoma of the Parotid Gland Originating from an Epithelial-Myoepithelial Carcinoma: Report of a Rare Case. Head and Neck Pathol 14, 283–289 (2020). https://doi.org/10.1007/s12105-019-01034-0

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Keywords

  • Salivary duct carcinoma
  • Parotid gland
  • Epithelial-myoepithelial carcinoma
  • Dedifferentiation