A Case of Sarcomatoid Carcinoma Arising from Mucinous Cystadenocarcinoma of Appendix

Sarcomatoid carcinoma or carcinosarcoma is a very rare biphasic tumor characterized by a combination of malignant epithe-lial and mesenchymal cells. The pathogenesis of sarcomatoid carcinoma is not fully elucidated and the guideline of treatment has not been established yet. Although the upper aerodigestive tract, lung and female urogenital system are known to be the most frequently affected, this tumor also can occur in various sites, including the digestive tract. Since sarcomatoid carcinom