Mediastinal tumors have long fascinated the thoracic surgeon of their variety and unpredictability of iagnosis prior to exploration.We report the analysis of the 34 cases of mediastinal tumors,experenced in the dept.of the Thoracic and Cardiovascular Surgery of the National Medical Center.Between the 1993.9-1992.12. The age distribution was relatively even and the mean age was 35 years old.The thymomas were 16 cases [ 47% ].the lipoma were 4 cases [12%].the germ cell tumors were 7 cases [20%].the neurogenic tumors were 3 cases [8%].Histologically analysised .The malignant tumors were 16 cases [17.6%] in classified by hisotlogical types.the tumor size,location,and the clinical manifestation are presented.The successful removal was done in 28 cases [ 100%] among 28 cases of benign mediastinal tumors. Among the 6 cases of malignancy mediastinal tumors, the surgical intervention had done in 5 cases [ 83%] and inoperatable cases were 1 case [16.6%].There was no operative death.