Case report. Kiemcelneoplasie in situ in een monotestis hoeft niet direct behandeld te worden.

This case report describes a 32-year-old man with germ cell neoplasia in situ (GCNIS) after partial orchidectomy and contralateral orchidectomy because of a mixed germ cell tumor. The treatment of GCNIS in a solitary testis consists of radiotherapy, orchidectomy or surveillance. When choosing a treatment, it is important to take into account the desire to have children, the hormonal status, the risk of developing (recurrent) testicular cancer and the advantages and disadvantages of each treatment. This case shows that surveillance in case of an active desire to have children is safe in the short term and can have advantages over radiotherapy. In retrospect, when there is suspicion for bilateral testicular cancer, consultation with an Academic Testis Expertise Centre and cryosemen preservation is recommended when there is a desire to have children. [ABSTRACT FROM AUTHOR]