Seminoma is the most frequent carcinoma of the testicle in he fourth decade of life and constitutes 60% to 65% of germ cell neoplasias. Several histopathologic characteristics of the tumor have been evaluated and three types of pure seminoma have been described as follows: a) classic, b) anaplastic and c) spermatocytic. Internationally, three clinical stages for the determination of the extension of the tumor are admissible. Stage I is where the tumor is limited to the testis with or without invasion of epididymis or the spermatic cord. In Stage II the tumor has retroperitoneal lymph node metastases. Finally, in Stage III the tumor has distant metastases.
The germ cell tumor often gives lymph node metastasis, except from choriocarcinoma, which in an aggressive fashion is characterized by early hematogenous spread. We describe one of the very few cases worldwide where the spontaneous regression of a primary testicular tumor occurred after demonstration of retroperitoneal lymph node metastasis, a phenomenon known as burned-out seminoma.