The purpose of this study is to determine the long-term outcome in congenital undescended testis after surgical treatment by orchidopexy and to what extent orchidopexy is the treatment for congenital undescended testis.

Inclusion Criteria:

• The orchidopexy has taken place in the Medical Center Alkmaar between 1986-2004
• The indication concerned a congenital undescended testis
• It concerns a first orchidopexy to the concerning testis

Exclusion Criteria:

• Orchidopexy has taken place on an other reason than congenital undescended testis (for example: torsio testis)
• It concerns re-orchidopexy