[Primary retroperitoneal seminoma].

The case-history presents a case of a rare retroperitoneal tumour--primary retroperitoneal classical seminoma. This type of tumour accounts for half the extragonadal germinal tumours. From the clinical aspect this group is important as in addition to surgery it can be successfully treated by chemotherapy and radiation. The clinical findings in the authors' patient led to the diagnosis of a retroperitoneal tumour and after repeated examinations the authors concluded on the presence of some form of malignant mesenchymal tumour. A more aggressive surgical procedure implies radical removal of the tumour, and treatment was, based on the final histological diagnosis, supplemented by chemotherapy. Despite the favourable diagnosis of seminomas, we have to foresee in case of a primary tumour in the retroperitoneum a poorer prognosis (sometimes by as much as 50%) and despite all conclusions attention should be devoted to a possible late development a testicular tumour.