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is part of every male's genital system. If he is missing a testis, it could be undescended, means it is somewhere inside the abdomen. Does he have any swelling in the groin area, just above the thigh, as those are one of the regions the other testis must be hidden but most of the time it is not functional and must be removed to prevent risk of cancer in that. Consult with your Surgeon regarding this issue.