Bilateral Palpebral Plasmacytomas in a Pig

Abstract

A 6-month-old, castrated, crossbred pig exhibited severe swelling and ectropion of bilateral eyelids at slaughter. A thorough examination of the pig, including its visceral organs, revealed no other significant lesions. Histopathologically, plasmacytoid neoplastic cells proliferated diffusely in sheets beneath the palpebral conjunctiva. The neoplastic cells tested positive for immunoglobulin light chain, heavy chain, and MUM1, and tested negative for CD3, CD79, and CD20. The present case was diagnosed with plasmacytoma based on histopathology and immunohistochemistry.