TRPS1::PLAG1 Fusion in a Primary Cutaneous Myoepithelial Carcinoma: A Case Report and Literature Review.

Myoepithelial neoplasms are rare tumors that are found in the salivary glands, the breast, soft tissue, and skin. Myoepithelial carcinomas typically have a poor prognosis with a high rate of local recurrence and metastasis in the cutaneous setting. There are fewer than 30 described cases of primary cutaneous myoepithelial carcinoma in the literature. We performed a literature review and identified 26 known cases of primary cutaneous myoepithelial carcinoma. Here, we describe a case of occipital primary cutaneous myoepithelial carcinoma occurring in a 56-year-old patient. RNA sequencing was performed on the tumor which identified a TRPS1::PLAG1 fusion event which is to our knowledge, the first time this has been reported in the literature for a primary cutaneous myoepithelial carcinoma.