The guideline note on undescended testis compared two societies' recommendations item by item. This one cannot be written that way, because there are almost no recommendations to compare. On concealed penis, the EAU/ESPU Paediatric Urology guideline offers a few narrative paragraphs and a single graded recommendation; the AUA has no entry at all.
The purpose of this note is therefore different. Rather than summarising what is recommended, it documents precisely what is not. That gap is the common root of variation between surgeons, of parents hearing different advice at different clinics, and of the blanket reimbursement denial that Korea went through some years ago. The shape of the gap has to be drawn before it can be filled.
What the EAU/ESPU guideline actually says
Concealed penis is not a stand-alone chapter. It sits in a few paragraphs within "Phimosis and other abnormalities of the penile skin." Set out as it stands:
| Item | EAU/ESPU text | Status |
|---|---|---|
| Types | Buried penis and megaprepuce are congenital anomalies with skin folded abnormally around the shaft. Webbed penis has a high ventral scrotal attachment with an abnormal penoscrotal angle. Trapped penis is iatrogenic, caused by excessive skin excision | Narrative (ungraded) |
| Differential | All must be distinguished from micropenis and aphallia, in which the corpora themselves are small | Narrative (ungraded) |
| Natural history | Buried penis due to abnormal prepubic fat distribution may resolve spontaneously with growth or weight loss | Narrative (ungraded) |
| Circumcision | Do not perform simple circumcision when phimosis is associated with another penile anomaly such as buried penis or congenital curvature. Buried penis and megaprepuce are listed as contraindications because the foreskin may be needed for reconstruction | Strong recommendation |
| Indication for surgery | — | None |
| Timing of surgery | — | None |
| Technique | — | None |
| Follow-up · outcome measures | — | None |
As the table shows, the only graded recommendation is the circumcision contraindication. And it is not a recommendation on how to treat concealed penis; it is a recommendation on how not to perform a different operation when concealed penis is present. On the management of concealed penis itself, the guideline grades nothing.
AUA
The AUA has no guideline or policy document on paediatric concealed penis. Cryptorchidism has a 2014 guideline reaffirmed in 2025; no equivalent document has ever been produced for concealed penis. It is mentioned descriptively in the AUA's paediatric educational material (Core Curriculum), which is not a recommendation document.
The EAU separately publishes a guideline on Penile Size Abnormalities and Dysmorphophobia (2023), but this is an adult sexual-medicine document and does not address paediatric concealed penis.
What the guidelines do not say
Listed item by item, these are the points on which clinical judgement actually diverges.
Whom to operate on
Symptom-based indications (urine trapped in the prepuce, recurrent balanoposthitis, voiding difficulty) and appearance- or psychology-based indications coexist in the literature, with no recommendation on which of them justifies surgery. How to regard an asymptomatic child whose main problem is appearance was the crux of the Korean reimbursement dispute — and the guideline does not answer it.
When to operate
The literature holds opposing views — early surgery (Shapiro, Herndon) versus waiting until the child can take part (Shenoy) — and the guideline adopts neither. This contrasts with cryptorchidism, where a window of "after six months and before eighteen months" exists.
Which technique
More than thirty techniques have been described; the guideline mentions none. The likely reason is that comparative studies are scarce and that the outcome measures they use are subjective. Herndon et al. reported that the technique used did not significantly alter long-term outcome; Frenkl et al. concluded that the number of fixation sutures did not affect recurrence.
What counts as an outcome
There is no definition of success. Whether it means improved exposure, symptom resolution, parental satisfaction or absence of recurrence has never been agreed, so series cannot be compared. As Hadidi himself noted, most reports rest on subjective assessment by parents and surgeons.
How to follow up
Recurrence (late re-burial) is reported, yet there is no recommendation on the duration or method of follow-up. In Hadidi's 61 patients, 5 (9%) underwent reoperation, and only 5 were followed beyond six years.
What the gap produces
Variation between surgeons. For the same child, one centre recommends surgery and another recommends waiting. Neither is in breach of a guideline — because there is no guideline to breach.
Confusion for parents. A parent who hears different advice at different clinics assumes someone is wrong. In fact it is a difference of clinical philosophy — but there is no reference document that explains this.
Reimbursement disputes. Without a defined indication, the same operation looks cosmetic to a reviewer and functional to the surgeon. Korea's blanket denial some years ago, and the society-level discussion that followed, is the case in point. The dispute was not settled by one side being right; it was settled by the recognition that no standard existed.
Why the evidence is thin
The absence of recommendations is not negligence on the part of the societies. There is no evidence from which to build them, for three reasons.
First, the numbers are small. The largest single series in the literature has fewer than 80 patients, and all cases reported up to 2011 total 868 (Lardellier-Reynaud et al.) — with inclusion criteria that vary from series to series.
Second, the definitions differ. Buried, concealed, hidden, inconspicuous, megaprepuce, trapped and webbed are used by different authors with different criteria. The same name groups different patients, and different names separate the same ones. Series cannot be pooled in that state. This is discussed in Part 1 for clinicians.
Third, the outcome measures are subjective. Stretched penile length is hard to measure in this condition, there is no validated scale for degree of exposure, and satisfaction is reported without standardised tools. Without comparable outcomes there can be no comparative studies, and without comparative studies there can be no recommendations.
What would be needed to fill it
What is needed is not another technique. In order, it is the following.
An agreed definition. At minimum, a working definition of what is called concealed penis and what is excluded must exist before anything else becomes possible. The proposals of Hadidi (2014) and Cimador (2015) are a starting point.
Quantified symptom-based indications. A cohort in which trapped urine, frequency of balanitis and voiding discomfort are recorded in a standardised way is required before anyone can say in which patients surgery improved symptoms.
Patient-reported outcomes. Satisfaction and discomfort measured with standardised instruments rather than the impressions of surgeon and parent. As long as much of this surgery targets appearance and psychology, the result cannot be assessed unless those are measured.
Long-term follow-up. Cohorts followed beyond puberty. The question Frank posed — why adult urologists do not see these patients — still has no data to answer it.
The survey I am conducting among parents of surgical patients falls under the third of these, patient-reported outcomes: the reason for seeking care, perceptions of the appropriateness of timing, and discomfort and satisfaction before and after surgery, asked with standardised items. The survey is still in progress and it is too early to present organised results, but as the data accumulate they will be reflected in this note.
References
- EAU Guidelines on Paediatric Urology. Phimosis and other abnormalities of the penile skin. European Association of Urology, 2026.
- EAU Guidelines on Penile Size Abnormalities and Dysmorphophobia. European Association of Urology, 2023.
- Kolon TF, Herndon CDA, Baker LA, et al. Evaluation and treatment of cryptorchidism: AUA guideline. J Urol. 2014;192(2):337-345.
- Hadidi AT. Buried penis: classification surgical approach. J Pediatr Surg. 2014;49(2):374-379.
- Cimador M, Catalano P, Ortolano R, Giuffrè M. The inconspicuous penis in children. Nat Rev Urol. 2015;12(4):205-215.
- Herndon CDA, Casale AJ, Cain MP, Rink RC. Long-term outcome of the surgical treatment of concealed penis. J Urol. 2003;170(4 Pt 2):1695-1697.
- Frenkl TL, Agarwal S, Caldamone AA. Results of a simplified technique for buried penis repair. J Urol. 2004;171(2 Pt 1):826-828.
- Lardellier-Reynaud F, Varlet F, François M, Mouriquand P. Congenital buried penis in children. Prog Urol. 2011;21(9):642-650.
- Frank JD. Editorial comment. BJU Int. 2000;86(4):526.
- Kim SW. Concealed penis from the perspective of pediatric urology. Urology Digest. 2021;2(2). (in Korean)