Cutaneous myxosarcoma in a Syrian hamster (Mesocricetus auratus)

Cagnini, Didier QuevedoHeckler, Marta Cristina ThomasMoya-Araujo, Carla FredrichsenAraújo, Gustavo Henrique MarquesAmorim, Renée Laufer

The pathological findings in a 2-years-old Syrian hamster (Mesocricetus auratus) with a cutaneous myxosarcoma are described. Grossly, there was a large cutaneous mass in the right cervical region. Microscopical evaluation revealed a myxosarcoma characterized by pleomorphic, fusiform cells loosely arranged, randomly distributed, and presenting a moderate amount of basophilic amorphous stroma. There were hemorrhagic areas within the tumor. The basophilic amorphous stroma was positive to Alcian blue confirming the presence of a mucopolysaccharide matrix. Immunohistochemically, the neoplastic cells expressed vimentin, and were negative for cytokeratin or glial fibrillary acidic protein (GFAP).

1. Pathology.
2. Hamster
3. Patologia.
4. Myxosarcoma
5. Mixossarcoma
6. Neoplasia