Adenomyoma is considered as benign and slow growing, but its potential neoplastic nature cannot be excluded. However, the histogenesis of these tumors is subject to further study. Carcinosarcoma of the digestive organs has been reported to exhibit aggressive behavior. Carcinosarcomas in digestive organs have been reportedly associated with a poor prognosis.12,13 However, some cases that have been treated with a curative operation showed long-term survival.