Squamoid eccrine ductal carcinoma of the vulva: A case report

Abstract Introduction/Objective A 53-year-old female sought medical attention for left vulvar pain and a vulvar lesion. Methods/Case Report Physical examination revealed a 1.0 x 1.0 cm lesion within a background of lichen sclerosus. Biopsy demonstrated a carcinoma with tubular and glandular architecture, areas of squamoid differentiation and widespread perineural invasion. Ancillary immunohistochemistry testing with keratin 7 highlighted foci of ductal differentiation. Tumor cells were also positive for p53, p63, pankeratin, and keratin 5/6. The Ki-67 proliferation index was approximately 15%. Tumor cells were negative for Keratin 20, PAX 8, p16, and CD 34. We diagnosed the lesion as a vulvar sweat gland adenocarcinoma of the squamoid eccrine ductal subtype. Results (if a Case Study enter NA) N/A Conclusion Carcinomas of vulvar sweat gland origin are extremely rare, comprising less than 1% of all vulvar cancers. To the best of our knowledge, this is the first case report of squamoid eccrine ductal carcinoma afflicting the vulva.