How is dx of cryptorchidism?

Normally when a baby is born the doctor should put his hand on the scrotum and he must find a testis. When a patient comes with abdominal pain, and we find out that we don’t have a testis, so the pain is related to the site. Why pain? Since the descend makes it get stuck in the abdomen where we don’t have gubernaculum. (That connects the testis to scrotum) The testis will make torsion leading to pain. It twists every time OR If patient came for physical exam and we do MRI we find that the testis is outside the scrotum.