In a group of 212 patients with germinal tumours of the testicle treated at the urological clinic in Hradec Králové in 1975-1987 there were 7 with an extragonadal tumour in the retroperitoneum. In all the dominating symptom was a palpable resistance in the epigastrium, backache and secondary signs of malignant disease. In the first four a radical extirpation of the tumour was performed, in one with replacement of the aorta always with left nephrectomy. After introduction of cisplatinum into combined chemotherapy this became the initial treatment. Of the seven patients two died from generalization of the basic disease, the third one from exsanguination through an erosion of an aortal graft.