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Prof. Dr. Ali Avanoğlu
Undescended Testicle • Diagnosis and evaluation

How Necessary Are Ultrasound and MRI for Undescended Testicle?

A significant number of families come to pediatric urology already holding an ultrasound report. Yet for undescended testicle, ultrasound and MRI are tests the guidelines do not recommend routinely: they don't change the decision for a palpable testicle, and they don't give a reliable answer for a non-palpable one. This page explains why, and the exceptions.

Who this is forFamilies arriving with an ultrasound or MRI report, or who have been told 'the testicle was not seen'
Reading≈6 min
ByProf. Dr. Ali AvanoğluUpdated
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01 · What do the guidelines say?02 · For a palpable testicle: the decision doesn't change03 · For a non-palpable testicle: 'not seen' does not mean 'not there'04 · When imaging is genuinely useful05 · If you already have a report, what should you do?
In brief5 madde
  • What do the guidelines say?: The European (EAU/ESPU) and American (AUA) pediatric urology guidelines show a rare degree of agreement on this point: the diagnosis and classification of undescended…
  • For a palpable testicle: the decision doesn't change: If the testicle can be felt in the groin or above the scrotum, its location, size, and how far it can be brought down have already been established by examination.
  • For a non-palpable testicle: 'not seen' does not mean 'not there': The real difficulty arises with the non-palpable testicle.
  • When imaging is genuinely useful: In some situations imaging does have a place, and your physician will point this out separately.
  • If you already have a report, what should you do?: If you've had an ultrasound or MRI done, bring the report — but don't let the result either reassure or frighten you.
01

What do the guidelines say?

The European (EAU/ESPU) and American (AUA) pediatric urology guidelines show a rare degree of agreement on this point: the diagnosis and classification of undescended testicle is made by examination; ultrasound, MRI, or CT are not routinely recommended.

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  • This recommendation does not mean imaging is 'useless' — it means the answer imaging provides does not change the treatment decision, and it can create false reassurance or false alarm. Systematic reviews have reported that the sensitivity and specificity of ultrasound for a non-palpable testicle are insufficient for decision-making.
  • Even so, imaging is often requested because access to examination — and examiner experience — is not the same everywhere. An experienced pediatric urology examination can usually give the answer that ultrasound cannot.
02

For a palpable testicle: the decision doesn't change

If the testicle can be felt in the groin or above the scrotum, its location, size, and how far it can be brought down have already been established by examination. Ultrasound only repeats this information; it does not change whether surgery is needed, its timing, or its technique.

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  • The testicular volume ultrasound measures in this group sometimes causes unnecessary worry for families. Small volume differences between the two testicles are common in infancy and, on their own, don't carry significance; the real assessment happens during the examination and surgery.
  • Another downside of ultrasound for a palpable testicle is time. While waiting for the appointment, the scan, and the report, the 6–12-month surgical window can narrow — this is one of the sources of delay the guidelines highlight.
03

For a non-palpable testicle: 'not seen' does not mean 'not there'

The real difficulty arises with the non-palpable testicle. A testicle inside the abdomen may not be visible on ultrasound because it's hidden behind bowel gas; a small, soft testicle may be indistinguishable from surrounding tissue. That's why the statement 'testicle not seen on ultrasound' doesn't indicate the testicle is absent — cases where the testicle is sitting, alive, inside the abdomen and is found at laparoscopy despite a negative ultrasound are far from rare.

  • Not seen ≠ absent: a testicle inside the abdomen often isn't visible on ultrasound
  • Seen ≠ testicle: the structure marked in the groin may be a remnant or a lymph node
  • Whatever the result, the next step is the same: examination under anesthesia + laparoscopy
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  • The opposite also happens: the structure ultrasound labels as 'testicle' in the groin may actually be a small atrophic remnant (nubbin), a lymph node, or soft tissue — or the testicle may genuinely be in the groin, but it would have been found on examination anyway. Either way, imaging does not change the surgical plan, because for a non-palpable testicle the path the guidelines recommend is the same regardless of the result: a repeat examination under anesthesia and, if needed, diagnostic laparoscopy.
  • MRI, and especially MR angiography showing the vascular anatomy, can be more informative than ultrasound; but in an infant it requires sedation or anesthesia, is costly, and can still miss a testicle inside the abdomen. Because a 'not there' result doesn't rule out laparoscopy, and a 'there' result doesn't make laparoscopy unnecessary, MRI is also not routinely recommended.
04

When imaging is genuinely useful

In some situations imaging does have a place, and your physician will point this out separately. In children with significant overweight, groin fat tissue can make examination difficult, and ultrasound can help point toward a testicle in the inguinal canal and guide the examination; even so, the decision is confirmed by examination.

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  • In bilateral non-palpable testicle, especially with an additional finding such as hypospadias, abdominal and pelvic ultrasound can be part of the evaluation — not to 'search' for the testicle, but to visualize the internal reproductive organs and complete the endocrine and genetic assessment.
  • In adolescents and adults, imaging also has a different role: ultrasound may be needed to assess the testicle's structure, size, and whether there's a suspicious mass. If torsion is suspected with sudden pain, Doppler ultrasound may be performed; however, surgery is never delayed to obtain imaging in suspected torsion.
05

If you already have a report, what should you do?

If you've had an ultrasound or MRI done, bring the report — but don't let the result either reassure or frighten you. 'Testicle not seen' means neither that the testicle doesn't exist nor that nothing can be done; 'testicle in the groin' is information the examination would provide anyway.

  • In our practice, the path for a non-palpable testicle is completed in the same session regardless of the imaging result: a repeat examination while the child is asleep, diagnostic laparoscopy through a thin camera at the navel if it's still not palpable, and descent in the same session depending on the findings. These sequential steps are carried out through the joint evaluation of two pediatric urologists; this pathway answers the question imaging cannot.
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Frequently asked questions
The ultrasound didn't show the testicle. Does that mean it's absent?
No, this result doesn't show that the testicle is absent. A testicle inside the abdomen often isn't visible on ultrasound. Whether the testicle exists and where it is becomes clear through examination under anesthesia and, if needed, diagnostic laparoscopy.
Ultrasound found the testicle in the groin — so laparoscopy isn't needed anymore, right?
The structure ultrasound marks in the groin may or may not be the testicle. If it's palpable on examination, laparoscopy isn't needed anyway and standard orchiopexy is planned; if it's not palpable, a repeat examination in the operating room — and laparoscopy if needed — is performed regardless of what the ultrasound says.
Isn't MRI more definitive than ultrasound?
MRI is more informative in some cases; but in infants it requires anesthesia or sedation and can still miss a testicle inside the abdomen. Because its result doesn't change the decision for laparoscopy either way, the guidelines don't routinely recommend MRI either.
The ultrasound report says the other testicle is enlarged; what does that mean?
Marked enlargement of the other testicle can suggest that the affected testicle may be missing or non-functioning. However, this finding alone doesn't establish a diagnosis and doesn't remove the need for laparoscopy; your physician interprets it together with the other findings.
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Related pagesFull index →
BasicsPalpable and Non-Palpable TesticleIn undescended testicle, all treatment planning starts with a single distinction made at examination: can the testicle be felt or not? A palpable testicle is the most common and most predictable group; for a non-palpable testicle, whether it exists and where it is located is clarified in the operating room, with examination under anesthesia and laparoscopy.Diagnosis and evaluationExamination Under AnesthesiaFor a non-palpable testicle, the next step after the exam is neither ultrasound nor MRI — it's a new examination performed while the child is under anesthesia, with the muscles relaxed. This short but decisive step often clarifies, on its own, how the surgery will proceed.Diagnosis and evaluationDiagnostic LaparoscopyDiagnostic laparoscopy (a minimally invasive procedure) is direct visualization of the inside of the abdomen through a thin camera introduced at the navel, and it's the only method that definitively answers both 'is there a testicle' and 'where' in a non-palpable testicle. This page explains how the procedure is performed and how the plan proceeds for every possible finding.Diagnosis and evaluationExamination and EvaluationUndescended testicle is diagnosed neither by ultrasound nor by blood tests — it is diagnosed through an experienced pediatric urology examination. This page explains exactly what the examination looks for, why how the testicle "behaves" matters so much, and how to prepare for the exam.
Undescended Testicle topic clustersMain treatment page →
Basics 7Diagnosis and evaluation 6Surgery in children 10Special situations 4After surgery 6Adolescents and adults 6Follow-up 3
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