Adult Disorders of Testicular Function (2) Other disorders (hyperprolactinaemia, radiation, cyclophosphamide therapy, autoimmunity, paraplegia, androgen resistance) can cause isolated infertility or combined defects in different subjects. See later: • Hypothalamic–Pituitary–Testicular Disorders • Testicular Defects • Testicular Abnormalities and Systemic Disease • Androgen Resistance in Adults • Disorders of Sperm Transport • Causes of Male Infertility • Histology of Testicular Disorders