Hypospadias, cryptorchidism and common male genital disorders

Overview & Definition

Three problems dominate the paediatric male genital examination at the newborn check and the infant clinic. The first is hypospadias, in which the urethral meatus opens on the undersurface of the penis rather than at the tip of the glans, almost always with a hooded prepuce that is deficient on its ventral aspect and often with a downward curvature of the shaft called chordee. [9] The second is cryptorchidism, the undescended testis, in which one or both testes fail to reach the bottom of the scrotum and come to rest somewhere along the line of normal descent or, less often, in an ectopic position. [1] The third is a group of common acquired disorders of the foreskin and the scrotal contents: the physiological and pathological phimoses, the paraphimosis, the communicating hydrocele, and the indirect inguinal hernia.

The reason these conditions are taught together is that hypospadias and cryptorchidism share an embryological and endocrine origin. Skakkebaek and colleagues proposed the testicular dysgenesis syndrome to explain why hypospadias, cryptorchidism, poor semen quality, and testicular germ-cell cancer have risen together over recent decades, attributing the cluster to disturbed gonadal development in fetal life under the influence of genetic susceptibility and environmental endocrine-disrupting chemicals. [7] A boy found to have both hypospadias and an undescended testis is therefore not a chance occurrence of two separate conditions but a signal that the whole genital tract developed abnormally, and that signal triggers a disorder-of-sex-development evaluation. [8]

The clinical task at the bedside is to detect these conditions on the newborn and infant examination, to distinguish the anomalies that need surgery from the variants that resolve on their own, and to time the surgical referral correctly. Two timing rules carry almost all of the examination marks. The foreskin of a boy with hypospadias must be preserved because it is the tissue used to reconstruct the urethra, so circumcision is absolutely contraindicated. [12] The undescended testis that has not reached the scrotum by six months of corrected age will not descend spontaneously, and orchidopexy between 6 and 18 months preserves the germ cells and the future fertility of that testis. [1] [3]

Classification

Hypospadias is classified by the position of the ectopic urethral meatus, and that position predicts the difficulty of the repair and the likelihood of an associated chordee. The great majority, around 50 to 70 percent, are distal or anterior, with the meatus on the glans, the coronal sulcus, or just below it on the subcoronal shaft. A smaller group, around 20 to 30 percent, are middle or mid-shaft. The remainder are proximal or posterior, with the meatus on the proximal shaft, at the penoscrotal junction, on the scrotum, or in the perineum; these proximal forms carry the worst chordee and the highest rate of associated urogenital and endocrine anomalies. [9] [10]

[9]

A useful variant to recognise is the megameatus intact prepuce, in which the foreskin is complete and normal in appearance and the hypospadias is hidden until the foreskin is retracted; this is a distal hypospadias with a widely dilated urethral groove and it is the form most easily missed on a cursory newborn check. [9] Chordee, the ventral curvature of the penile shaft, is graded clinically by the artificial erection test performed at surgery and is the principal determinant of whether a single-stage or a staged repair is needed. [10]

[8]

Cryptorchidism is classified along two axes that together determine the management. The first is whether the testis is palpable or impalpable, because a palpable testis has completed its descent through the internal ring and can be brought to the scrotum by a standard groin orchidopexy, whereas an impalpable testis is either inside the inguinal canal, inside the abdomen, or absent, and needs examination under anaesthesia with diagnostic laparoscopy. [1] The second axis is unilateral versus bilateral, because a bilateral impalpable testis in a phenotypic male raises the question of a disorder of sex development and demands urgent endocrine and genetic evaluation before any surgery. [6]

Epidemiology & Risk Factors

Hypospadias is one of the most common congenital anomalies in boys, with a reported incidence of around 1 in 200 to 300 live male births, or 0.3 to 0.7 percent. [8] The registries show a modest rise in incidence over the second half of the twentieth century, although Toppari and colleagues cautioned that the trend is hard to separate from changes in ascertainment and reporting. The recognised risk factors are a family history of hypospadias in a father or brother, low birth weight, assisted reproductive technology, advanced maternal age, and maternal exposure to endocrine-disrupting chemicals such as pesticides and certain plastics. [8] [7]

Cryptorchidism is even more common at birth, affecting roughly 1 to 3 percent of full-term male infants and up to 30 percent of premature infants, because testicular descent is one of the last events of fetal development. [5] Most of these testes descend on their own in the first three months, and by six months the prevalence has fallen to around 1 percent, which is the rate that persists into childhood. [1] The most important epidemiological fact for the examination is that a testis still undescended at six months of corrected age will not descend spontaneously and must be referred for surgery. [3]

The risk factors for cryptorchidism overlap heavily with those for hypospadias and point to the same testicular-dysgenesis mechanism. Prematurity and low birth weight are the strongest, because descent is incomplete at early gestational ages. [5] A family history, small-for-gestational-age status, and maternal factors such as diabetes, smoking, and endocrine-disrupting exposure all increase the risk. [7] The condition is more often right-sided than left-sided, and bilateral cryptorchidism, found in around 10 percent of cases, is the form that most threatens future fertility and most often heralds an underlying syndrome. [5]

[9]

Pathophysiology

The male urethra and the foreskin form between the eighth and the sixteenth week of gestation by the fusion of the paired urethral folds along the ventral surface of the genital tubercle, and hypospadias results when this fusion is incomplete or abnormal. [9] The ectopic meatus marks the point at which fusion stopped, and the hooded prepuce is the direct consequence: the prepuce forms by the growth of folds from the dorsal and lateral sides of the glans that meet ventrally, so when the ventral urethra is absent the ventral prepuce cannot form and the foreskin drapes only over the dorsum. [12] This is precisely why the foreskin must be preserved in hypospadias: it is the spare tissue that the surgeon tubularises to rebuild the missing ventral urethra.

[7]

Testicular descent happens in two phases and is the key to understanding both cryptorchidism and the timing of its correction. The transabdominal phase, between weeks 8 and 15, draws the testis from its retroperitoneal origin to the internal inguinal ring under the control of insulin-like factor 3 and the gubernaculum. The inguinoscrotal phase, between weeks 26 and 34, moves the testis through the inguinal canal and down into the scrotum under androgen control, and it is this second phase that is most often disturbed, producing the common inguinal undescended testis. [6]

The damage caused by leaving a testis in the warm abdomen or groin is progressive and time-dependent, and it is the entire justification for early orchidopexy. Huff and colleagues showed that the germ cells, the spermatogonia that determine future fertility, begin to deteriorate in the undescended testis from the latter half of the first year of life, with the loss of the transform­ing spermatogonia and the adult dark spermatogonia that are the stem cells of spermatogenesis. [4] The higher temperature of the non-scrotal position drives this maldevelopment, and the longer the testis remains undescended the greater the loss. [5] Orchidopexy by 18 months at the latest is intended to bring the testis into the cooler scrotum before the germ-cell loss becomes irreversible. [3]

The testicular dysgenesis syndrome provides the unifying explanation for why hypospadias and cryptorchidism so often coexist and why both are linked to later infertility and testicular cancer. [7] In this model a disturbance of fetal gonadal development, driven by genetic susceptibility and environmental endocrine disruptors, produces malformations of the whole male reproductive tract at once. A testis that developed abnormally is also more prone to malignant transformation in adult life, which is why the previously cryptorchid male carries a lifelong increased risk of testicular cancer and must practise testicular self-examination. [5]

Clinical Presentation

The presentation of hypospadias is the newborn or infant examination finding of an abnormally placed urethral meatus, a hooded prepuce, and a penis that may curve downward on erection. [9] In the most common distal form the anomaly is obvious as soon as the foreskin is examined, but the megameatus intact prepuce variant is concealed under a normal-looking foreskin and is detected only when the foreskin is gently retracted, which is one reason a careful genital examination is part of every newborn check. [9] Severe proximal hypospadias with a perineal meatus and bifid scrotum may raise the question of a disorder of sex development at birth. [10]

The presentation of cryptorchidism is the empty or partially empty scrotum found on examination. [1] The testis may be impalpable, suggesting an intra-abdominal or absent testis, or palpable in the inguinal canal, at the external ring, or in an ectopic position such as the femoral or perineal region. The testis that is sometimes in the scrotum and sometimes in the groin is the retractile testis, a normal variant that must be distinguished from the true cryptorchid testis by demonstrating that, once milked into the scrotum, it stays there without tension. [11]

The common acquired disorders present in older infants and children. A physiological phimosis, in which the foreskin is naturally non-retractile in the preschool boy, is universal at birth and usually resolves without treatment. A pathological phimosis presents with a scarred, whitish, non-retractile foreskin, often with a history of ballooning on micturition or recurrent balanitis, and in the older boy this appearance is most often balanitis xerotica obliterans, a lichenoid dermatosis. [12] Paraphimosis presents acutely with a painfully swollen, oedematous foreskin retracted behind the glans that cannot be reduced. A communicating hydrocele presents as a painless scrotal swelling that varies in size over the day and transilluminates brilliantly, and an indirect inguinal hernia presents as a reducible groin mass that may extend into the scrotum. [11]

Differential Diagnosis

The principal task in hypospadias is to separate the isolated distal form, which is a straightforward surgical problem, from the proximal or syndromic form that mandates a search for associated anomalies. [10] Any boy with a proximal hypospadias, a bifid scrotum, or an impalpable testis in addition to the hypospadias must be evaluated for a disorder of sex development, because the coexistence of hypospadias and cryptorchidism raises the probability of an underlying chromosomal or endocrine abnormality to roughly 50 percent in the most severe phenotypes. [8] Pure chordee without a hypospadiac meatus is a distinct entity that may need straightening but carries a lower association with DSD.

The principal task in cryptorchidism is to distinguish the truly undescended testis from the conditions that mimic it. The retractile testis is the most important mimic and the source of most unnecessary referrals: it is a normally descended testis that has been pulled up into the groin by an active cremasteric reflex, and the test is to bring it down into the scrotum and confirm that it remains there once the cremaster relaxes. [11] An ectopic testis has descended through the external ring but come to rest in an abnormal location such as the perineum or the femoral region, and it always needs surgery because it will never reach the scrotum on its own. A vanishing or absent testis is the result of prenatal vascular infarction and presents as a unilateral impalpable testis with a contralateral hypertrophied testis. [6]

The scrotal swellings have their own differential. A hydrocele transilluminates and is confined to the scrotum unless it communicates through a patent processus vaginalis. An inguinal hernia may extend into the scrotum, does not transilluminate if it contains bowel, and carries the risk of incarceration. [11] An adolescent varicocele presents as a bag-of-worms left-sided scrotal swelling in the standing boy and, if it is large or associated with a smaller testis, needs urological assessment for possible impact on fertility. The acute scrotum from testicular torsion is covered in its own topic but must never be forgotten in any boy with acute testicular pain.

Clinical & Bedside Assessment

The genital examination must be performed in a warm room with warm hands and a relaxed, warm child, because a cold or anxious boy retracts his testes and makes the examination impossible. [11] The recommended position is the frog-leg or cross-legged squatting position, which relaxes the cremaster. The examiner uses one hand to anchor the testis in the scrotum or to milk an inguinal testis down from above, and the other to palpate. A genuinely undescended testis is sought along the line of descent from the abdominal wall through the inguinal canal to the scrotum, and the ectopic positions are checked. [1]

For hypospadias the examination documents three findings: the precise location of the urethral meatus, the presence and degree of chordee, and the configuration of the prepuce. [9] The meatus is inspected, and the foreskin is gently retracted to exclude the megameatus intact prepuce variant. The presence of a hooded prepuce alone, even with a glanular meatus, is enough to label the case hypospadias and to forbid circumcision. The scrotum is examined for symmetry and for an associated undescended testis, and the boy is examined for a bifid scrotum or other DSD stigmata. [10]

[11]

The assessment of the foreskin in the older boy distinguishes physiological from pathological phimosis. Physiological phimosis is soft, supple, and non-retractile without scarring; pathological phimosis shows a whitish fibrotic ring, often typical of balanitis xerotica obliterans, and may be associated with ballooning or balanitis. [12] The communicating hydrocele is confirmed when the scrotal swelling reduces or changes size when the child lies flat or when the fluid is compressed, distinguishing it from the non-communicating hydrocele that does not change. Growth parameters and the general examination are reviewed for syndromic features, and the family history is taken for hypospadias, cryptorchidism, and testicular cancer. [7]

Investigations

Hypospadias is a clinical diagnosis and needs no imaging or laboratory testing in the uncomplicated distal form. [9] The indication for investigation is the proximal or syndromic phenotype, in which the coexistence of hypospadias with an impalpable testis, a bifid scrotum, or severe chordee warrants an evaluation for a disorder of sex development. That evaluation includes a karyotype, a pelvic and inguinal ultrasound to seek Müllerian structures and gonads, and the measurement of serum electrolytes, 17-hydroxyprogesterone, testosterone, luteinising hormone, follicle-stimulating hormone, and anti-Müllerian hormone. [8]

Cryptorchidism is likewise a clinical diagnosis in the palpable testis, which needs no imaging because the role of ultrasound in locating a palpable testis does not change the management and adds no useful information. [1] Imaging does not reliably locate the impalpable testis either, and the diagnostic tool of choice for the impalpable testis is examination under anaesthesia, proceeding to diagnostic laparoscopy if the testis is not felt. Laparoscopy distinguishes an intra-abdominal testis, which can be brought down in one or two stages, from a vanishing testis with only a blind-ending spermatic vessel stump. [6]

The bilateral impalpable testis, or the unilateral impalpable testis with hypospadias, triggers the urgent endocrine and genetic workup. [6] The karyotype identifies the chromosomal sex, the 17-hydroxyprogesterone and the electrolytes screen for congenital adrenal hyperplasia, and the hormone profile defines the gonadal and hypothalamic-pituitary-gonadal axis function. Anti-Müllerian hormone, produced by Sertoli cells, confirms the presence of functioning testicular tissue when the gonads are impalpable, and a stimulating human chorionic gonadotrophin test may be used to confirm bilateral anorchia when the basal hormones are unrecordable. [5]

Management — Resuscitation

Most of these conditions are not resuscitation emergencies, but three presentations demand immediate action and must be recognised without delay. The first is the phenotypic male newborn with bilateral impalpable testes, which is a disorder of sex development until proven otherwise and which may be congenital adrenal hyperplasia in a virilised 46,XX infant carrying the risk of a salt-wasting adrenal crisis. [6] The infant must have the electrolytes and the 17-hydroxyprogesterone checked urgently, the family counselled, and paediatric endocrinology involved before any surgical planning.

The second is the paraphimosis, in which a retracted foreskin forms a constricting band behind the glans and obstructs venous return, producing a swollen, painful glans that becomes progressively more difficult to reduce. [11] Paraphimosis is a urological emergency that is reduced by steady manual compression of the oedematous glans, often after the application of local anaesthetic cream or, in resistant cases, after a dorsal slit or aspiration of the glans. Delay risks ischaemia and necrosis of the glans, so the swelling must be reduced promptly.

[11]

The third is the acute scrotum from testicular torsion, which is covered in detail in its own topic but which must be the default assumption in any boy with sudden severe testicular pain and a high-riding, tender testis. [1] Testicular torsion carries a maximum six-hour window from the onset of pain to detorsion if the testis is to be saved, so a suspected torsion is explored surgically without waiting for imaging, and the message to families and to the examining clinician is always that acute scrotal pain is torsion until proven otherwise.

Management — Definitive & Stepwise

The definitive management of hypospadias is surgical, and the single most important pre-operative decision is made not in the operating theatre but at the newborn examination: the boy with hypospadias must never be circumcised, because the hooded dorsal prepuce is the tissue used to reconstruct the urethra. [12] Once the diagnosis is made, the family is referred to paediatric urology and the repair is planned for between 6 and 18 months of age, a window chosen to balance the anaesthetic safety of the older infant against the psychological impact of surgery on the older child. [9]

[9]

The distal hypospadias is repaired in a single stage, most commonly by the tubularised incised plate urethroplasty, in which the urethral plate is incised longitudinally to widen it, tubularised around a catheter to form the new urethra, and covered with a vascularised flap of the inner prepuce to prevent fistula formation. [9] The question of whether to reconstruct the foreskin or to perform a circumcision at the end of the repair is decided with the family; foreskin-preserving repairs are increasingly offered for distal hypospadias and have acceptable cosmetic outcomes, although circumcision remains the standard completion for the more proximal repairs. [12] The proximal hypospadias with severe chordee may need a staged repair, in which the straightening and the skin preparation are done first and the urethroplasty is completed at a second operation several months later. [10]

The definitive management of cryptorchidism is surgical orchidopexy, and the timing is the most tested fact in the topic. The testis that is still not in the scrotum at six months of corrected age will not descend spontaneously, so the American Urological Association and the European Association of Urology with the European Society for Paediatric Urology both recommend orchidopexy between 6 and 18 months of age, ideally within the first year and no later than 18 months. [1] [2] The operation brings the testis out of the groin or the abdomen, mobilises the spermatic cord to gain length, and fixes it in a subdartos pouch in the scrotum. [3]

The non-palpable testis is managed by examination under anaesthesia, and if the testis is still not felt, by diagnostic laparoscopy. An intra-abdominal testis close to the internal ring with an adequate cord length can be brought down in a single-stage orchidopexy; a higher testis may need a first-stage Fowler-Stephens procedure in which the spermatic vessels are clipped to allow a collateral blood supply to develop, followed by a second-stage brought-down several months later. [6] A blind-ending spermatic vessel stump confirms a vanishing testis and needs no further procedure, though a contralateral fixation may be offered to protect the single remaining testis. Hormonal therapy with human chorionic gonadotrophin or gonadotrophin-releasing hormone is not routinely recommended for undescended testis because its descent rate is poor and it carries recognised adverse effects on the germ cells. [1]

[9]

The foreskin and scrotal disorders are managed on their own simpler pathways. Physiological phimosis is reassured and observed, and it is not pathological unless it persists with scarring beyond three to four years of age or is associated with ballooning or balanitis. [12] Pathological phimosis is treated first with a course of topical corticosteroid cream applied to the tight ring, which softens the tissue and achieves retraction in the majority, reserving circumcision for those who fail or who have established balanitis xerotica obliterans. A communicating hydrocele and an indirect inguinal hernia both reflect a patent processus vaginalis, so both are repaired surgically, the hernia promptly because of the risk of incarceration and the communicating hydrocele once it persists beyond the age of two years. A non-communicating hydrocele in the infant usually resolves spontaneously and is observed. [11]

Specific Subtypes & Scenarios

The megameatus intact prepuce is a deceptively normal-looking variant of distal hypospadias in which the foreskin is complete and the diagnosis is revealed only on retraction, showing a widely open glanular urethral groove. [9] It is a reminder that the foreskin must be retracted as part of every newborn genital examination, because a circumcised megameatus forfeits the very tissue that makes a straightforward tubularised incised plate repair possible. The variant is repaired in the same single-stage fashion as any distal hypospadias. [9]

The proximal hypospadias with severe chordee is the most challenging surgical scenario and the one most likely to need a staged repair. [10] After the artificial erection test confirms the degree of curvature, the penis is straightened by degloving, by dorsal plication of the tunica albuginea for mild curvature, or by ventral lengthening for severe curvature, and the urethroplasty is completed at a second stage using a free graft or a pedicled flap of the inner prepuce. The complication rate is higher than for distal disease, and these boys need long-term follow-up for fistula, stricture, and recurrent curvature. [10]

[6]

Acquired cryptorchidism, also called the ascending testis, is the testis that was correctly in the scrotum in early childhood and then ascended, most often in boys with a retractile testis that has gradually become fixed in the groin as the spermatic cord failed to elongate with growth. [11] Up to a third of retractile testes ascend over time, which is why the retractile testis is not dismissed but followed annually until puberty. Acquired cryptorchidism is managed by orchidopexy on the same principles as the congenital form, and the outcome for fertility is generally good when the testis is brought down before puberty. [11]

The bilateral non-palpable testis in the phenotypic male is the scenario that most demands a systematic approach, because it may be a disorder of sex development, bilateral anorchia, or bilateral intra-abdominal cryptorchidism. [6] The karyotype, the electrolytes, the 17-hydroxyprogesterone, the testosterone, and the anti-Müllerian hormone are checked, and a human chorionic gonadotrophin stimulation test distinguishes bilateral anorchia, in which there is no testosterone response, from functioning intra-abdominal testes. Laparoscopy confirms the anatomy and allows orchidopexy or removal, and lifelong androgen replacement is planned for the boy confirmed to have bilateral anorchia. [5]

Complications & Pitfalls

The complications of hypospadias surgery reflect the technical difficulty of building a new tube from skin in a small child. The urethrocutaneous fistula, in which urine leaks through a separate hole along the suture line, is the commonest complication and occurs in roughly 5 to 15 percent of distal repairs and more often in proximal disease. [9] Meatal stenosis, urethral stricture, breakdown of the repair, and residual or recurrent chordee are the other recognised complications, and the proximal repairs carry the highest rates. A boy who returns with a weak stream, a spray, or a second urinary stream after hypospadias repair needs urological reassessment for these complications. [10]

The complications of untreated or late-treated cryptorchidism are infertility and testicular cancer, and they are the reason the timing of orchidopexy is so heavily emphasised. The undescended testis that is corrected late has fewer germ cells and a higher risk of azoospermia, and bilateral cryptorchidism corrected in adulthood is associated with infertility in the majority of men. [5] The risk of testicular germ-cell cancer is two to three times higher in a previously cryptorchid testis even after orchidopexy, so the corrected patient must practise lifelong testicular self-examination and present with any new testicular lump. [5]

The most dangerous pitfall is the circumcision of a boy with unrecognised hypospadias. [12] A hooded prepuce or a ventral meatus that is missed and circumcised destroys the tissue needed for the urethroplasty, converting a straightforward single-stage repair into a difficult reconstruction that may require a free graft. The corollary is that every newborn genital examination must inspect the meatal position and the foreskin, and that the foreskin is never removed until hypospadias has been excluded. [9] Other pitfalls are the mislabelling of a retractile testis as undescended leading to unnecessary surgery, and the failure to investigate the bilateral impalpable testis for a disorder of sex development. [6]

Prognosis & Disposition

The prognosis of distal hypospadias repaired in expert hands is excellent, with a satisfactory cosmetic and functional outcome in the great majority and a complication rate in single figures. [9] The proximal forms have a more guarded surgical outlook, with higher complication and reoperation rates, and they need long-term follow-up through childhood into adolescence to detect fistula, stricture, and recurrent curvature. The psychological outcome is best when the repair is completed in infancy before the child forms a body image, which is part of the rationale for the 6 to 18 month window. [9]

The prognosis of cryptorchidism depends on the side, the timing of surgery, and the underlying cause. A unilateral palpable testis brought down within the recommended window has a good prognosis for fertility, with sperm counts in adulthood that are intermediate between the general population and men with bilateral disease. [5] Bilateral cryptorchidism has a poorer fertility outlook even with well-timed surgery, and the intra-abdominal testis carries the worst prognosis for both germ-cell function and malignancy. The disposition for every cryptorchid patient is lifelong surveillance for testicular cancer through self-examination, because the risk persists after orchidopexy. [1]

The physiological phimosis, the non-communicating hydrocele, and the retractile testis all have an excellent prognosis with conservative management, and the reassurance of the family is the principal intervention. [11] The pathological phimosis, the communicating hydrocele, and the inguinal hernia are cured by surgery, and the paraphimosis reduced promptly has a good outcome with no long-term sequelae provided the ischaemia has not been prolonged. The disposition for all these conditions is back to the general paediatrician with a clear plan and a defined point of urological review. [12]

Special Populations

The boy with a disorder of sex development is the population in whom hypospadias and cryptorchidism converge with the highest stakes. The coexistence of a proximal hypospadias and an impalpable testis, or any bilateral non-palpable testis, places the child in a category that demands a coordinated evaluation by paediatric endocrinology, urology, genetics, and psychology, and the family needs careful and sensitive counselling about the sex of rearing and the long-term plan. [8] The principles of care are open communication with the family, avoidance of premature surgery, and a multidisciplinary approach to decisions about gonadal retention or removal and the cancer risk that some dysgenetic gonads carry. [6]

Aboriginal and Torres Strait Islander children and children from rural and remote areas may present later with undiagnosed hypospadias or cryptorchidism when the routine newborn examination has been missed or the family has not had access to specialist services. [2] The emphasis in these populations is on opportunistic genital examination at every primary care contact, on cultural safety in the counselling about genital surgery, and on the coordination of outreach urology services so that the orchidopexy window is not missed because of distance. Migrant and refugee families may have different cultural expectations around circumcision that must be respectfully addressed when explaining the no-circumcision rule in hypospadias. [2]

The premature and low-birth-weight infant has a far higher rate of cryptorchidism because testicular descent is a late fetal event, and the testis in these infants must be rechecked at the corrected age rather than the chronological age when the six-month decision is made. [5] The adolescent with a varicocele, a residual hypospadias complication, or a previously corrected undescended testis needs transition to adult urology, education in testicular self-examination, and, for the boy with bilateral anorchia, a plan for androgen replacement and fertility counselling through the adult service. [11]

Evidence, Guidelines & Regional Differences

The modern timing of orchidopexy rests on a convergent body of evidence and guideline recommendation. The American Urological Association cryptorchidism guideline, led by Kolon, recommends referral if the testis is not descended by six months of corrected age and orchidopexy by an experienced surgeon within the next year. [1] The European Association of Urology and the European Society for Paediatric Urology guidelines, summarised in the 2024 update by Skott and colleagues, recommend orchidopexy between 6 and 18 months of age. [2] The narrative review by Batra traced the historical shift from orchidopexy in late childhood to the current early window, driven by the germ-cell evidence that the testis begins to lose its spermatogonia within the first year and a half of life. [3]

The biological basis for early surgery was established by the histological studies of Huff and colleagues, who showed that the germ-cell population of the cryptorchid testis and even of its descended partner deteriorates from the latter half of infancy. [4] The testicular dysgenesis syndrome, articulated by Skakkebaek and colleagues, provides the framework that links hypospadias, cryptorchidism, subfertility, and testicular cancer as manifestations of disturbed fetal gonadal development under genetic and environmental influence. [7] Toppari and colleagues documented the epidemiological trends in hypospadias and cryptorchidism and the methodological limits of the registry data behind the reported rise. [8]

[2]

Controversies remain in a few areas. The routine use of hormonal therapy with human chorionic gonadotrophin or gonadotrophin-releasing hormone to bring down an undescended testis is not recommended because the descent is rarely durable and the hormones may further damage the germ cells. [1] The role of imaging in the impalpable testis is limited because laparoscopy is both diagnostic and therapeutic. The management of the dysgenetic gonad in a disorder of sex development, the timing of prophylactic gonadectomy, and the approach to gender of rearing are areas of evolving practice that demand individualised multidisciplinary decisions. [6]

Exam Pearls

The two highest-yield facts in this topic are the no-circumcision rule in hypospadias and the 6 to 18 month orchidopexy window in cryptorchidism, and both should be the first answers in any examination stem. [12] [1] The hooded prepuce is the marker that hypospadias is present even when the meatus appears glanular, and the dorsal foreskin it represents is the tissue used for the urethroplasty, so a boy with any degree of hypospadias must not be circumcised. The testis still undescended at six months of corrected age will not descend on its own, and orchidopexy is performed between 6 and 18 months to preserve the germ cells that begin to decline in the second six months of life. [3] [4]

The retractile testis is the examination trap. It is a normal variant that stays in the scrotum once milked down, and the candidate who calls it undescended and refers it for surgery has fallen into the commonest pitfall of the genital examination. [11] The converse trap is the bilateral impalpable testis, which is a disorder of sex development until proven otherwise and which may be congenital adrenal hyperplasia carrying the risk of a salt-wasting crisis, so the karyotype, the electrolytes, and the 17-hydroxyprogesterone are checked urgently. [6]

The testicular dysgenesis syndrome is the framework that earns the higher-order marks. It explains why hypospadias and cryptorchidism coexist, why both are rising in parallel with subfertility and testicular cancer, and why the previously cryptorchid male must practise lifelong testicular self-examination. [7] The paraphimosis is the one acute emergency, reduced by steady manual compression of the swollen glans, and the acute scrotum is testicular torsion until proven otherwise with a six-hour salvage window. [11] The physiological phimosis is universal at birth and resolves on its own, while the pathological phimosis with its whitish scarred ring of balanitis xerotica obliterans is treated with topical corticosteroid before circumcision is considered. [12]

References

1. [1]Kolon TF, Herndon CD, Baker LA, et al Evaluation and treatment of cryptorchidism: AUA guideline. J Urol, 2014.PMID 24857650
2. [2]Skott M, Bhatt N, Bhatt J, et al European Association of Urology-European Society of Paediatric Urology Guidelines on Paediatric Urology: Summary of 2024 Updates. Eur Urol, 2025.PMID 40118740
3. [3]Batra NV, Black M, Komiya K, Bagnara A, De Coppi P A narrative review of the history and evidence-base for the timing of orchidopexy for cryptorchidism. J Pediatr Urol, 2021.PMID 33551366
4. [4]Huff DS, Wu HY, Snyder HM 3rd, et al Histologic maldevelopment of unilaterally cryptorchid testes and their descended partners. Eur J Pediatr, 1993.PMID 8101802
5. [5]Lee PA, Coughlin MT, Bellinger MF Cryptorchidism. Curr Opin Endocrinol Diabetes Obes, 2013.PMID 23493040
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