Malignant Melanoma in a Female Mallard Duck (Anas platyrhynchos)

Melanomas are malignant neoplasms originating from melanocytes. They reported in birds. In this case, macroscopic and microscopic (the histopathologic and IHC) findings supported a final diagnosis of cutaneous malignant melanoma in a mallard duck (Anas platyrhynchos). A female mallard duck (Anas platyrhynchos) was observed with a mass on the ventral portion of the neck. The bird was anesthetized with Diazepam/Ketamine. A skin incision was made on the ventral surface of the mass and blunt dissection was performed to separate the mass. The incision was sutured by a simple interrupted suture pattern. Mass was surgically excised for histopathological evaluation. Histologically, the mass was composed of nests and sheets of anaplastic, epithelioid, multinucleated and polygonal cells containing variable amounts of brown to black granules of melanin. The neoplasm showed immunoreactivity for S-100 and Melan-A in the cytoplasm of the neoplastic cells. Based on the histopathological and IHC findings, this is the first report of malignant melanoma in a mallard duck (Anas platyrhynchos).