What Is an Undescended Testis (Cryptorchidism)?
An undescended testis, medically called cryptorchidism (from the Greek kryptos = hidden, orchis = testis), is one of the most common congenital conditions in boys. It occurs when one or both testes fail to travel from the abdomen — where they develop in the fetus — down through the inguinal canal and into the scrotum before birth.
Undescended Testis vs. Retractile Testis:
What's the Difference?
This is one of the most important distinctions in pediatric urology — and one that causes significant anxiety for parents. A careful clinical examination by a specialist is essential.
Undescended Testicle
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Cannot be brought into the scrotum
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Returns immediately if partially moved down
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May be palpable in the groin or completely impalpable
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Position unchanged by warmth or relaxation
Retractile
Testicle
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Can be guided into the scrotum
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Stays in the scrotum without tension
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Due to an overactive cremasteric reflex
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More prominent when cold or anxious
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Resolves by puberty
Why Is Surgery Necessary for Undescended Testis?
Why treat?
Preserve Fertility
The longer a testis remains undescended, the greater the risk of impaired sperm production. Early surgery preserves the full fertility potential.
Reduce Cancer Risk
Undescended testis carries a 3–5× higher lifetime risk of testicular cancer. Orchidopexy reduces — but does not eliminate — this risk.
Prevent Torsion
An undescended testis is more prone to twisting, which can cause sudden acute pain and requires emergency surgery if blood supply is cut off.
Treat Associated Hernia
The majority of undescended testes are accompanied by a hernia sac, which is repaired at the same operation.
Psychological Benefit
Having a normal scrotal appearance matters for a child's body image and psychological wellbeing as they grow older.
Enable Monitoring
A testis in the scrotum can be examined and monitored by the patient and by doctors throughout life — an impalpable intra-abdominal testis cannot.
Surgical Timing: When Should My Child Have the Operation?
Timing is one of the most evidence-based aspects of undescended testis management. The goal is to operate early enough to preserve testicular tissue, but not so early that anaesthetic risk is unnecessarily high in a very small infant.
When to act?
Guideline Recommendation (EAU / AAP / BAPS)
Surgery should be performed between 6 and 18 months of age.
Operating after 18 months — and certainly after 2 years — is associated with progressively worse fertility outcomes.
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