Extraskeletal mesenchymal chondrosarcoma (EMC) is a rare malignant tumor in domestic animals. We described a case of EMC in a cat with a mass measuring 18cm in diameter, yellowish-white and firm attached to the muscles in left hind limb. Cytological examination revealed the presence of individual pleomorphic spindle cells and clusters of small oval cells with no hard edges in the midst of an amorphous intercellular matrix. Due to the impossibility of treatment and poor prognosis, the cat was euthanized. Microscopically undifferentiated spindle cells and clusters of pleomorphic chondroid cells were observed. The CME diagnosis was confirmed with thealcian blue, Masson's trichrome and immunohistochemistry techniques, using antivimentin antibodies.
cat; neoplasm; extraskeletal chondrosarcoma
