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OverviewAetiologyPathophysiologyClinical features and red flagsInvestigationsDifferential diagnosisManagementComplicationsMonitoring and follow-upSpecial situationsCommon pitfallsQuestionsSources
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Educational draft · awaiting clinical reviewThe full textbook explains uncertainty but does not replace live national or local guidance, specialist advice, or current prescribing information.

Undescended testes, hypospadias and acute scrotum

Paediatrics and child health · UK scope · Sources checked 27 Aug 2026 · Clinical review pending

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Suspected testicular torsion

Sudden severe unilateral scrotal or lower abdominal pain, nausea or vomiting, a high-riding horizontal testis and absent cremasteric reflex suggests spermatic-cord torsion. Neonates may present with a firm discoloured painless scrotal mass.

Action: Notify the senior paediatric surgical or urology team immediately, keep the child nil by mouth, obtain intravenous access and analgesia, and transfer directly for urgent scrotal exploration when torsion cannot be confidently excluded. Do not delay surgery for blood tests or Doppler ultrasound; salvage falls steeply after about 6 hours.

Overview

Examine testes and penile anatomy accurately, refer persistent cryptorchidism and hypospadias at the right age, protect foreskin needed for repair, recognise differences of sex development, and treat suspected torsion as a surgical emergency.

Testes develop in the abdomen and descend through the inguinal canal late in gestation. Prematurity and low birth weight increase cryptorchidism because descent may be incomplete at birth; corrected age matters when planning early reassessment.

A true undescended testis lies along the normal descent pathway, while an ectopic testis deviates elsewhere. An impalpable testis may be intra-abdominal, absent or atrophic; physical localisation is often uncertain until laparoscopy.

Retraction is an active cremasteric response and does not require immediate surgery, but annual examination is needed because an ascending testis can become persistently non-scrotal. Document whether it remains after manipulation rather than simply writing present or absent.

Cryptorchid testes have impaired temperature-dependent germ-cell maturation and increased torsion, trauma and malignancy risk. Orchidopexy improves position and surveillance and may improve fertility potential, but does not restore a completely normal baseline risk.

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Paediatrics and child healthOriginal SBA

Hypospadias at newborn examination

A newborn has a ventral urethral opening, dorsal hooded foreskin and both testes palpable in the scrotum. What is the best next step?

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Sources and review status5 sources · checked 27 Aug 2026 · clinical review pending+
Sources

Sources and review status

National guidance is shown before implementation-dependent detail. Apply principles in context and verify current guidance when a decision affects care. Source check completed 27 Aug 2026; clinical approval remains outstanding.

  • NHS undescended testiclesDetection, early recheck, referral timing, orchidopexy and family information.
  • NHSGGC neonatal atypical genitalia guidelineBilateral undescended testes, hypospadias and urgent DSD escalation.
  • NHS paediatric hypospadias informationAnatomy, no circumcision, repair and complications.
  • BAUS testicular torsionImmediate surgical management, exploration and time-dependent salvage.
  • NHS testicle painPublic emergency advice for sudden severe testicular pain.

Editorial contact: Doctor’s Passport editorial team. Source-check date is separate from clinical approval. Report a content problem · Content changes

Authoring stateComplete draftClinical stateAwaiting reviewJurisdictionUnited Kingdom
Hypospadias results from incomplete ventral urethral and foreskin development. The meatus ranges from near the glans to perineal; functional impact depends on opening position, curvature, tissue quality and urinary stream, not the label alone.

Examine hypospadias before any circumcision decision. Record glanular, coronal, shaft, penoscrotal or perineal location; chordee; foreskin; stretched penile length when indicated; bifid scrotum; and testicular palpability.

Mild distal hypospadias with both testes descended is usually an outpatient urology problem. Proximal anatomy, micropenis, bifid scrotum or undescended testes raises endocrine and chromosomal questions and needs coordinated communication that avoids premature sex assumptions.

Testicular torsion occurs when the spermatic cord twists, obstructing venous return before arterial inflow and causing ischaemia. Pain may wake an adolescent from sleep and commonly accompanies nausea or vomiting.

Examine both testes, lie, tenderness, swelling, skin, cremasteric reflex, abdomen and groins. Epididymitis more often has gradual epididymal tenderness and urinary features, but age or urinalysis cannot safely overrule a torsion-compatible story.

Torsion of the appendix testis often produces focal upper-pole tenderness and sometimes a blue-dot sign with preserved testicular lie. It is generally treated with rest and analgesia after torsion of the testis is confidently excluded.

Doppler ultrasound has false-negative and delay risk, especially early, intermittent or partial torsion. Surgical exploration is simultaneously the definitive diagnostic test and the opportunity to restore flow.

Neonatal torsion is often extravaginal and may be prenatal, presenting as a hard painless discoloured mass. Management timing is specialised, but contralateral fixation is considered because asynchronous torsion can threaten the remaining testis.

Key points

  • Undescended testis is absent from the bottom of the scrotum and cannot be manipulated to remain there. A retractile testis can be brought down without tension and stays transiently after cremaster fatigue.
  • Examine every newborn and again at the 6–8-week physical examination in warmth, with relaxed hips, sweeping from groin towards scrotum and documenting each side separately.
  • Spontaneous descent occurs mainly in the first 12 weeks. Refer bilateral undescended testes earlier, usually after the 6–8-week review, and unilateral persistence by about 4–5 months.
  • Orchidopexy is usually performed around age 1 year; early treatment supports germ-cell development, permits surveillance and reduces but does not abolish later malignancy risk.
  • Do not routinely order ultrasound for an impalpable testis before surgical referral; examination and operative assessment determine location and management more reliably.
  • Hypospadias combines a ventral urethral opening, dorsal hooded foreskin and possible ventral curvature or chordee. Describe meatal site, stream, curvature, glans and both testes.
  • Do not circumcise a child with hypospadias because foreskin can be required for repair. Refer to paediatric urology; many repairs are planned between about 12 and 18 months depending on anatomy and centre.
  • Proximal hypospadias plus one or both undescended testes is not merely two common anomalies: involve endocrinology and a multidisciplinary differences-of-sex-development team promptly.
  • The acute scrotum differential includes testicular torsion, torsion of an appendix testis, epididymitis, incarcerated hernia, trauma, IgA vasculitis, idiopathic oedema and tumour.
  • Torsion peaks in neonates and adolescents but can occur at any age. Abdominal pain may dominate and the scrotum must be examined in a boy with unexplained lower abdominal pain.
  • The reference-standard diagnostic and therapeutic step when torsion remains possible is urgent scrotal exploration. Doppler can assist genuinely low or equivocal pathways only when it does not delay surgery.
  • At exploration, a viable torsed testis is untwisted and fixed and the contralateral testis is usually fixed; non-viable tissue may require orchidectomy after consent discussion.

Aetiology

01

Incomplete testicular descent

Prematurity, low birth weight, hormonal or anatomical factors interrupt migration from abdomen through inguinal canal into scrotum.

02

Ventral urethral maldevelopment

Incomplete fusion of urethral folds produces a ventral meatus, characteristically hooded foreskin and variable penile curvature.

03

Bell-clapper fixation anomaly

Abnormal intravaginal testicular attachment permits the spermatic cord and testis to rotate freely, especially around puberty.

04

Neonatal extravaginal rotation

The spermatic cord and tunica can twist together before scrotal attachments mature, sometimes during the antenatal period.

Pathophysiology

  1. 1
    Temperature-related germ-cell injury

    A testis retained above the scrotum remains warmer, progressively impairing germ-cell maturation and future fertility potential.

  2. 2
    Abnormal urinary direction

    A ventral meatus and chordee may direct urine downward and later interfere with erections or penetrative sexual function.

  3. 3
    Venous outflow obstruction

    Cord twisting first blocks venous drainage, causing congestion, oedema and rising tissue pressure before arterial infarction.

  4. 4
    Progressive testicular ischaemia

    Continued spermatic-cord torsion stops arterial supply, leading to haemorrhagic necrosis and a rapidly declining testicular salvage probability.

Clinical features and red flags

Testicular position

Examine in warmth and document scrotal, retractile, palpable inguinal, ectopic or impalpable position on each side.

Hypospadias anatomy

Record meatal site, urinary stream, chordee, foreskin, penile size when relevant and whether both testes are palpable.

Differences-of-development clues

Proximal meatus, bifid scrotum, micropenis or bilateral impalpable testes requires urgent multidisciplinary assessment.

Torsion history

Establish exact onset, suddenness, duration, nausea, vomiting, prior self-resolving episodes and lower abdominal pain.

Torsion examination

Assess lie, height, tenderness, swelling and cremasteric reflex, but do not use one reassuring sign to exclude torsion.

Red flags requiring action

  • Sudden severe testicular, scrotal, groin or lower abdominal pain with nausea or vomiting is torsion until urgently excluded by a surgeon.
  • A high-riding or horizontal testis, absent cremasteric reflex or rapidly increasing tenderness supports torsion, but no single sign safely excludes it.
  • A painful irreducible groin or scrotal swelling with vomiting suggests an incarcerated hernia and requires emergency surgical assessment.
  • Bilateral impalpable testes in a newborn, proximal hypospadias, bifid scrotum, micropenis or genital ambiguity requires urgent specialist differences-of-sex-development assessment.
  • Hypospadias with poor urinary stream or inability to void requires urgent assessment; do not circumcise because foreskin may be needed for reconstruction.
  • A previously scrotal testis that becomes persistently non-scrotal may be acquired ascent and needs referral rather than reassurance as a retractile testis.

Investigations

  1. 01
    First-line: expert physical examinationFirst stepFirst line
    Why
    Classify testicular position, hypospadias anatomy and acute torsion probability.
    Interpretation and limitations
    Document side and specific findings; a torsion-compatible history and examination goes directly to surgical assessment.
  2. 02
    Reference standard: urgent scrotal explorationReference standard
    Why
    Diagnose torsion definitively and restore blood supply during the same procedure.
    Interpretation and limitations
    Explore whenever torsion cannot confidently be excluded; fix viable testis and usually the contralateral side, or remove non-viable tissue.
  3. 03
    Doppler ultrasound only without delay
    Why
    Assess perfusion when specialist clinical probability is genuinely low or equivocal.
    Interpretation and limitations
    Residual flow does not always exclude partial or intermittent torsion; imaging must never postpone indicated exploration.
  4. 04
    Urinalysis and culture
    Why
    Support UTI or epididymitis assessment after urgent torsion reasoning.
    Interpretation and limitations
    A positive urine result does not reliably exclude simultaneous torsion and should not delay surgery when suspicion persists.
  5. 05
    Endocrine, genetic and imaging assessment
    Why
    Investigate bilateral impalpable testes, proximal hypospadias or atypical genital development.
    Interpretation and limitations
    A specialist DSD team directs urgent electrolytes, hormones, chromosomes and pelvic imaging; avoid isolated non-urgent testing.

Differential diagnosis

01

Retractile testis

A strong cremaster pulls a normally descended testis upward, but it can be manipulated down and remain temporarily without tension.

02

Torsion of appendix testis

More gradual focal upper-pole pain and a blue-dot sign suggests appendage infarction after testicular torsion is excluded.

03

Epididymitis

Progressive epididymal pain, dysuria, fever or positive urine studies suggests inflammation, but torsion must remain the priority.

04

Incarcerated inguinal hernia

An irreducible tender groin-scrotal mass with vomiting can compromise trapped bowel and requires immediate emergency surgical review.

05

IgA vasculitis or trauma

Purpura, dependent oedema or a clear injury can explain scrotal pain only after torsion is confidently excluded.

Additional chapter-specific clues

Alternative acute cause

Check groins, abdomen, urine symptoms, trauma, purpura and focal appendage tenderness while surgical escalation proceeds.

Management

01Undescended testisExamine, recheck and referFirst stepOne or both testes are not at the scrotal bottom in a newborn.+
  1. 1Document palpability and position at newborn examination and recheck at 6–8 weeks, considering corrected age in prematurity.
  2. 2Refer bilateral persistence promptly after the early review and unilateral persistence by about 4–5 months; do not delay referral for ultrasound.
  3. 3Paediatric surgery plans orchidopexy, commonly around age 1 year, and explains fertility, tumour and follow-up implications.
02HypospadiasProtect tissue and define anatomyThe urethral meatus lies on the ventral penis rather than the glans tip.+
  1. 1Do not circumcise; record meatal position, chordee, stream, foreskin, penile size when indicated and testicular position.
  2. 2Refer distal isolated disease routinely to paediatric urology for shared surgical decision-making.
  3. 3EscalationEscalate proximal hypospadias, bifid scrotum, micropenis or undescended testes promptly to a multidisciplinary DSD service.
03Acute scrotumExplore when torsion remains possibleA child develops acute scrotal, groin or unexplained lower abdominal pain.+
  1. 1Record onset and examine immediately, notify the senior surgical team, keep nil by mouth, provide analgesia and obtain intravenous access.
  2. 2Proceed to urgent scrotal exploration if torsion cannot confidently be excluded; do not wait for routine blood tests or ultrasound.
  3. 3At surgery untwist and fix a viable testis and usually fix the other side, or perform orchidectomy when irreversibly non-viable with appropriate consent.
04Non-torsionTreat the confirmed alternativeAlternativeSurgical assessment has confidently excluded testicular torsion.+
  1. 1Use rest, scrotal support and analgesia for torsion of the appendix testis, with review if pain persists or diagnosis changes.
  2. 2Treat epididymitis only according to urine findings, age and underlying urinary risk rather than automatic antibiotics.
  3. 3AlternativeArrange emergency hernia management, trauma imaging or IgA vasculitis care according to the alternative diagnosis.

Complications

01

Subfertility

Bilateral cryptorchidism, delayed orchidopexy or ischaemic testicular loss reduces germ-cell reserve and future mature sperm production.

02

Testicular malignancy

Cryptorchidism increases later germ-cell tumour risk; orchidopexy improves examination access but does not remove risk completely.

03

Testicular infarction

Delayed torsion treatment causes haemorrhagic necrosis, orchidectomy, later testicular atrophy and potential endocrine or fertility impact.

04

Hypospadias repair problems

Urethrocutaneous fistula, meatal stenosis, recurrent curvature, infection and cosmetic or functional dissatisfaction may require further surgery.

05

Psychological distress

Genital examination, surgery, fertility discussion and atypical development require privacy, sensitive language and continuing age-appropriate psychosocial support.

Monitoring and follow-up

  • Re-examine retractile testes at least annually through childhood because secondary ascent can occur.
  • After orchidopexy, monitor testicular position, size and wound recovery and teach later age-appropriate self-awareness without implying zero malignancy risk.
  • After hypospadias repair, monitor stream, fistula, meatal narrowing, curvature, infection and catheter or stent drainage.
  • After torsion surgery, document viability, fixation of each side, wound, pain and later testicular size because delayed atrophy can occur.
  • Provide urgent return advice for recurrent sudden pain even after previous intermittent symptoms or contralateral fixation.
  • Use sensitive longitudinal communication for fertility, genital appearance and DSD assessment, involving the young person increasingly with age.

Special situations

Warmth improves the examination

A warm room and relaxed frog-leg position reduce cremasteric retraction and help distinguish retractile from undescended testes.

Ultrasound can delay two diagnoses

It rarely localises an impalpable undescended testis reliably and may dangerously postpone exploration for torsion.

Foreskin is reconstructive tissue

Circumcision before urology review can remove tissue needed to create or support a new urethra.

Abdominal pain may be torsion

Adolescents may initially report only lower abdominal or groin pain, so genital examination prevents a missed surgical emergency.

Salvage is time dependent

Exploration within roughly 4–6 hours offers the best chance, but late presentation still requires immediate surgery.

Common pitfalls

  1. 01

    Do not call a testis retractile unless it can be brought down and remains without tension after cremaster fatigue.

  2. 02

    Do not delay surgical referral for an undescended testis while requesting ultrasound.

  3. 03

    Do not circumcise before hypospadias assessment.

  4. 04

    Do not treat proximal hypospadias with undescended testes as an isolated cosmetic issue.

  5. 05

    Do not exclude torsion because the patient is prepubertal, pain is abdominal or a urine dipstick is abnormal.

  6. 06

    Do not wait for Doppler ultrasound when torsion remains clinically possible.

  7. 07

    Do not attempt repeated manual detorsion as a substitute for urgent exploration and bilateral assessment.

  8. 08

    Do not reassure persistent pain as appendix-testis torsion without surgical review when diagnostic uncertainty remains.