Vulvar Complex Apocrine Carcinoma in a Horse (Equus caballus): A Case Report and Review of Literature.

The research article reports on a case of complex apocrine carcinoma found in a 6-year-old Marwari mare’s vulva, marking the first confirmed case of such a disease in equines.

Introduction and Case Description

• The research is centered on a 6-year-old Marwari mare that had recurrent vulvar growth. This growth was removed through surgery, after which it was routinely processed for analysis.
• Microscopic examination revealed that the growth was a neoplasm, showing proliferation of epithelial and myoepithelial cells arranged in a tubulopapillary pattern.

Diagnostic Process and Findings

• The diagnostic process involved histopathology, which is the microscopic examination of tissue in order to study the manifestations of disease, and immunohistochemistry, a lab method used to visually detect antigen-antibody interactions.
• The myoepithelial cells displayed strong immunoreactivity with smooth muscle actin alpha and p63. These are often used as markers in cancer research, helping in the identification of certain types of cancers.
• Based on the histopathology and immunohistochemistry results, the tumour was diagnosed as a complex apocrine carcinoma.

Implications and Significance

• This is the first confirmed example of a vulvar complex apocrine carcinoma in a horse. By documenting and investigating this case, the researchers are contributing valuable data to the literature on equine cancers.
• The findings may help improve the early diagnosis and treatment of such types of cancer in equines, especially considering the recurrent nature of the growth, which is a common feature in many cancers.