RESUMEN
Our topic take into consideration two cases of leiomyosarcoma: the first one was duodenal; the second gastric, both admitted at Surgical Emergency in an advanced degree. Difficulties were faced at every level especially in the first case where initial diagnosis was a false pancreatic cyst. The leiomyosarcoma was found out only one year later through the cytological study of fragments after reoperation. Difficulties in treatment are due to the uncertainty of the diagnosis, the degree and place of the tumor. The study of different cases shows that the leiomyosarcoma is successfully cured thanks to surgical operation, on the contrary of the others digestive sarcoma. The life esperance overtaking 5 years are frequent. These studies shows also that gastric leiomyosarcoma gives higher rate of survival than leiomyosarcoma in other level of digestive tract. The duodenum leiomyosarcoma is more difficult to determinate because of difficulties in operation. That is why it's necessary to make treatment of any leiomyosarcoma forend out through an operation