Multislice Spiral CT Features of Primary Seminoma of Extragonadal

Objective To analyze MSCT features of primary extragonadal seminoma and improve its diagnositic accuracy.Materials and Methods The clinical and MSCT findings of 5 patients with primary extragonadal seminoma proved by histopathology were analyzed retrospectively.5 cases were all males,aged 28 to 67,with an average age of 45.8.Two cases located in anterior mediastina,one located in retroperitoneal,one in pelvic cavity,one in saddle area.Each case showed single mass.Results Primary extragonadal seminoma usually occurred in the young or middle aged adults with no specific clinical manifestations.Two cases located in the anterior mediastina,the smaller one was oval like,the boundary was clear with capsule,the bigger one was shallow lobulated with central zone of necrosis and the boundary was not clear,infiltrating growth was found.One case located in retroperitoneal,which was lobulated with central zones of necrosis,infiltrating growth,and the abdominal aorta was circled.One in pelvic cavity was oval with capsule,the central necrosis was presented;One in saddle area,foci and strippled calcification was found.The solid part of lesion showed isodense or hyperdense on MSCT plan scan.4 cases received enhanced CT examinations,3 cases were enhanced heterogeneously,1 case was enhanced homogeneously.Conclusion Primary extragonadal seminoma is rare,MSCT is of great diagnostic and clinical values according to the configuration,size,density,its style of enhancement and surrounding infiltration of primary extragonadal seminoma.The accuracy of diagnosis of primary extragonadal seminoma depends on clinical,locaton,age and gender,the final diagnosis depends on pathology.