Vanishing Testis: What Does It Mean When a Testicle Disappears Before Birth?
Vanishing testis refers to a testicle that formed in the womb but was lost at some point in development when its blood supply was disrupted. It is one of the most common causes of a non-palpable testicle; the diagnosis is made at laparoscopy when blind-ending vessels are seen, meaning there is no testicle left to bring down.
Who this is forFamilies of children in whom no testicle is found at laparoscopy
What does vanishing testis mean?: Vanishing testis is a condition in which the testicle did form once in the womb, but later in development its blood supply was disrupted, causing it to atrophy and…
What is seen at laparoscopy?: Vanishing testis is not diagnosed by imaging, but by examination under anesthesia and diagnostic laparoscopy.
Should the remnant tissue be removed?: In vanishing testis, what remains is usually just a fibrous band and blind-ending vessels; whether or not to remove this is debated in the literature.
Should the other testicle be fixed in place?: This is the question families ask most often when a child is left with a single testicle, and the honest answer is that it, too, is debated.
Growing up with one testicle: what happens next?: A single healthy testicle is usually sufficient for hormone production and fertility; the remaining testicle typically grows somewhat larger to take over its function…
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What does vanishing testis mean?
Vanishing testis is a condition in which the testicle did form once in the womb, but later in development its blood supply was disrupted, causing it to atrophy and disappear. The testicle did not fail to form — it formed, and was then lost.
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The most widely accepted explanation is that the testicle twisted on itself (torsion before birth) during or shortly after its descent, or that some other problem interrupted its blood supply. Once blood flow is cut off, the testicular tissue shrinks away; what usually remains is only blind-ending vessels and the sperm duct (vas deferens).
This is known to be the cause in a significant proportion of non-palpable testicles found on examination. That is why, in a child with a non-palpable testicle, the central question in planning is whether a testicle is present inside the abdomen or has vanished — and only laparoscopy (a minimally invasive, keyhole approach) can answer that reliably.
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What is seen at laparoscopy?
Vanishing testis is not diagnosed by imaging, but by examination under anesthesia and diagnostic laparoscopy. Ultrasound or MRI failing to show the testicle does not establish this diagnosis.
Vessels and duct end blindly inside the abdomen: vanishing testis; no further procedure is needed.
Vessels enter the inguinal canal: the groin is opened; a living testicle or a remnant is looked for.
A testicle is seen inside the abdomen: it is brought down in the same session, or a staged approach is planned.
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There are two basic findings at laparoscopy. In the first, the testicular vessels and the sperm duct end blindly together inside the abdomen, above the internal ring (the abdominal-side opening of the inguinal canal); this finding is diagnostic of vanishing testis, and there is no need to open the groin. In the second, the vessels and duct pass through the internal ring into the inguinal canal; in that case the groin is opened to see what lies within it — either a living testicle or a small, non-functional remnant (a nubbin) may be found.
In our practice, all of these steps — re-examination under anesthesia, laparoscopy, and inguinal exploration if needed — are completed in a single session, with joint assessment by two pediatric urologists. The family is informed of every possible scenario before surgery, and the plan is finalized based on what is found during the operation.
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Should the remnant tissue be removed?
In vanishing testis, what remains is usually just a fibrous band and blind-ending vessels; whether or not to remove this is debated in the literature.
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Pathological examination of these remnants has found living sperm precursor cells (germ cells) in only a small proportion of cases. For this reason, some physicians leave blind-ending structures inside the abdomen in place, reasoning that the likelihood of future problems is very low. Others prefer to remove remnants that extend into the inguinal canal and send them for pathological examination, so that the diagnosis is definitively documented.
Practice varies by center. Our physicians do not recommend an additional procedure for structures that end blindly inside the abdomen; for remnants that are palpable in the inguinal canal or scrotum, they discuss removal and pathological examination together with the family.
04
Should the other testicle be fixed in place?
This is the question families ask most often when a child is left with a single testicle, and the honest answer is that it, too, is debated.
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The argument in favor of fixation rests on this: if the cause of the loss was torsion before birth, the remaining testicle may share a similar predisposition, and losing the only remaining testicle to torsion would be an irreversible outcome; a small additional procedure that fixes the testicle to the scrotum can reduce this risk. The opposing view points out that the risk of torsion in a healthy testicle is already low, that every operation carries its own small risks, and that the benefit of routine fixation has not been proven.
Guidelines offer no firm recommendation on this point; practice varies by center and by physician. In our practice, this decision is made in discussion with the family, taking into account the child's age, the examination findings of the remaining testicle, and the family's preference. Even when fixation is not performed, it is essential that the family understands that sudden testicular pain is an emergency and seeks care without delay.
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Growing up with one testicle: what happens next?
A single healthy testicle is usually sufficient for hormone production and fertility; the remaining testicle typically grows somewhat larger to take over its function (compensatory growth).
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Puberty proceeds as expected with a single testicle; paternity rates have been reported close to those of the general population, similar to boys with a history of unilateral undescended testicle. Even so, because the remaining testicle is the only one, it is worth protecting: annual checkups to monitor its position and growth, self-examination starting at adolescence, and protection from trauma are all important.
Having one side of the scrotum remain empty can bother some teenagers during adolescence; at that stage, a testicular prosthesis (a silicone implant placed in the scrotum) can be discussed as an option. Follow-up continues with the same team from childhood into adulthood, with adult urology included in that team.
Why did vanishing testis happen — did we do something during the pregnancy?
No. The testicle twisting before birth, or a blood supply problem in its vessels, is not the result of anything the mother did or did not do, and it is not a preventable condition. In most families, it occurs in only one child.
The testicle didn't show up on ultrasound — is laparoscopy still needed?
Yes. Ultrasound not showing the testicle does not mean it is absent; it frequently misses testicles located inside the abdomen. Guidelines recommend examination under anesthesia and diagnostic laparoscopy for a non-palpable testicle, and the diagnosis of vanishing testis can only be confirmed there.
Can a child father children with only one remaining testicle?
In most cases, yes. A single healthy testicle is usually sufficient for both hormone and sperm production, and paternity rates have been reported close to those of the general population. A definitive assessment is made in adulthood with semen analysis and a hormone profile.
When is a prosthesis considered for the empty side?
It usually comes up during or after adolescence, at the teenager's own request; an adult-sized prosthesis can be placed in a single procedure. A prosthesis is not required in a young child; the decision is made together with the family and child.
If the remaining testicle isn't fixed in place, what should we watch for?
Sudden, severe testicular, groin, or abdominal pain is an emergency for possible testicular torsion; go to the nearest emergency department without delay. Otherwise, annual checkups and self-examination starting at adolescence are sufficient.
What happens if no testicle is found at all?
If laparoscopy (the minimally invasive approach) finds no testicle and shows the vessels and sperm duct ending blindly, the testicle is considered to have vanished before birth, and the search is not continued further. In that case, the remaining testicle is assessed, remnant tissue is removed if appropriate, and the child is followed with a single testicle. A single, healthy, well-functioning testicle in the scrotum is sufficient for pubertal development and hormone production in most cases; a testicular prosthesis can be discussed later if desired.
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