Computed tomography imaging features of primary extragonadal seminoma-nine cases report and literature review

Primary extragonadal seminoma is relatively rare, which belongs to primary extragonadal germ dell tumor. Up to date, only a small number of literatures have been reported about its Computed Tomography (CT) features. In the present study, we reported 9 cases of primary extragonadal seminoma proved by histopathology. This report aims to demonstrate the CT features of infrequently occurred primary extragonadal seminoma. Based on the existing literatures and our 9 cases, we make a conclusion that primary extragonadal seminoma usually occurs in young or middle aged adults with no specific clinical manifestations, and CT is of great diagnostic and clinical values for this kind of tumor according to the configuration, size, density, style of enhancement and surrounding infiltration of the lesions, but the final diagnosis depends on pathology.