This chapter contains section titled: The Incidence of Varicocele The Anatomy of a Varicocele The Intratesticular Varicocele The Formation of a Varicocele Possible Causes of Testicular and Epididymal Dysfunction in Infertile Men with Varicocele The Semen Analysis in Varicocele Testicular Histology in Varicocele Endocrine Changes in Varicocele Clinical Presentation of a Varicocele Other Methods of Demonstrating the Presence of a Varicocele The Selection of Patients for Treatment of Varicocele The Clinical Management of a Varicocele The problem of the recurrent varicocele The Varicocele in the Child and Adolescent References