###Human: What is the role of undescended testis in fertility? ###Assistant: Hello. This condition is known as cryptorchidism (absence of one or both testes in the scrotum). If one of the testes has not descended as yet, then ideally it may have become dysfunctional already depending on the location of the testis, if it is still intra-abdominal or in the inguinal canal. There are high chances in such cases that the undescended testis may form a seminoma which is a tumor of the testis. If the other testis has descended, then it would be functional, and the chance of infertility is not there. Get an MRI pelvis done and most likely it would have to be removed. Also, get a semen culture done to check the sperm count and quality as well.Please meet your surgeon soon as undescended testis is not recommended to be kept to sit this long.