Congenital Abnormalities of the Genitourinary System

Congenital genitourinary abnormalities affect the kidneys, ureters, bladder, urethra or external genitalia. They range from incidental antenatal hydronephrosis to life-threatening urinary obstruction, renal failure or salt-wasting adrenal crisis.

Never miss: no urine by 24 hours, poor urinary stream, palpable bladder, bilateral flank masses, bladder mucosa exposed on the abdomen, severe hypospadias with undescended testes, atypical genital development, vomiting/dehydration with abnormal electrolytes, or respiratory distress with oligohydramnios history requires urgent paediatric evaluation.

Development and Classification

The ureteric bud and metanephric tissue form the kidneys and collecting system; ascent/rotation positions kidneys; the cloaca separates into urinary and anorectal channels; genital differentiation depends on chromosomes, gonads and hormones. Disruption produces congenital anomalies of kidney and urinary tract (CAKUT) or external genital differences.

Area	Important abnormalities	Main risk
Kidney	Agenesis, dysplasia, hypoplasia, multicystic dysplastic kidney, polycystic disease, ectopic/fused kidney	Renal failure, hypertension, infection
Drainage	Hydronephrosis, pelvi-ureteric junction obstruction, vesicoureteric reflux, ureterocele	Stasis, infection and renal scarring
Outlet/bladder	Posterior urethral valves, bladder exstrophy, neurogenic bladder	Obstruction, electrolyte disturbance, renal damage
External genitalia	Hypospadias, epispadias, undescended testis, hydrocele, differences of sex development	Urinary, fertility, endocrine and psychosocial consequences

Renal Agenesis, Hypoplasia and Dysplasia

Unilateral renal agenesis may be asymptomatic because one healthy kidney compensates. Confirm the solitary kidney and screen urinary/genital associations; protect long-term renal health through blood pressure, urine and kidney-function follow-up and avoidance of unnecessary nephrotoxins. Bilateral renal agenesis causes severe oligohydramnios, pulmonary hypoplasia and Potter sequence and is usually incompatible with survival; provide honest counselling and palliative support.

Multicystic dysplastic kidney is non-functioning renal tissue replaced by cysts. Ultrasound confirms diagnosis and the opposite kidney must be assessed. Many involute and are observed; nephrectomy is reserved for selected complications. Autosomal recessive polycystic kidney disease may produce enlarged kidneys, hypertension, renal impairment and congenital hepatic fibrosis, requiring nephrology care.

Antenatal Hydronephrosis and Urinary-Tract Obstruction

Hydronephrosis is dilation of renal pelvis/calyces. It may be transient or caused by pelvi-ureteric junction obstruction, reflux, ureterocele or lower-tract obstruction. Severity, bilaterality, ureter/bladder appearance and renal tissue determine risk.

Assessment and investigations

Review antenatal ultrasound, amniotic fluid and contralateral kidney.
Record urine timing/volume, stream, abdominal/bladder mass, fever, growth, BP and hydration.
Postnatal renal/bladder ultrasound is timed by clinical urgency because very early dehydration can underestimate dilation.
Voiding cystourethrogram assesses reflux and posterior urethral valves when indicated; nuclear renography assesses drainage and differential function.
Check creatinine, urea, electrolytes, urinalysis/culture when bilateral/severe disease, obstruction or infection is suspected.

Management

Mild isolated dilation may need serial ultrasound only. Febrile urinary infection requires prompt urine culture and protocol antibiotics. Antibiotic prophylaxis is not universal; nephrology/urology selects it for higher-risk reflux/obstruction. Progressive dilation, impaired function, recurrent infection or symptomatic pelvi-ureteric obstruction may require pyeloplasty or other corrective surgery.

Posterior Urethral Valves

Posterior urethral valves are obstructing leaflets in the male posterior urethra. High bladder pressure damages bladder, ureters and kidneys and may cause oligohydramnios with pulmonary hypoplasia.

Clinical features

Poor/dribbling stream, straining, prolonged voiding, palpable thick bladder, abdominal mass or failure to pass urine.
Respiratory distress at birth, dehydration, vomiting, failure to thrive, urinary infection or sepsis.
Hyponatraemia, hyperkalaemia, acidosis and raised creatinine in severe obstruction.

Emergency and definitive management

ABCDE, glucose, IV access, strict fluid balance and urgent paediatric urology/nephrology consultation.
Relieve bladder obstruction using a small urethral catheter by an experienced clinician; do not force against resistance. Suprapubic drainage may be required.
Monitor post-obstructive diuresis closely; replace fluids/electrolytes according to measured losses and laboratory results.
Treat hyperkalaemia, acidosis, sepsis and renal failure per emergency protocol; dialysis may be needed.
Valve ablation is definitive when infant is stable/large enough; temporary diversion may be used. Long-term bladder and renal dysfunction can persist despite relief.

Vesicoureteric Reflux

Vesicoureteric reflux is retrograde urine flow from bladder to ureter/kidney due to an incompetent junction. It predisposes to pyelonephritis and renal scarring but may resolve with growth. Management depends on grade, infections, renal damage and bladder function: observation, rapid assessment of fever, selected prophylaxis, bladder/bowel management, and endoscopic/surgical correction for persistent high-risk disease.

Bladder Exstrophy and Epispadias

In bladder exstrophy the bladder mucosa is open on the lower abdominal wall, often with separated pubic bones and epispadias.

Immediate care

Cover mucosa with sterile non-adherent dressing moistened with warm saline and a protective plastic layer; keep it moist and free from pressure.
Do not catheterise, scrub, apply antiseptic/powder or use ordinary diapers over exposed bladder.
Position carefully, collect urine without contaminating mucosa, maintain warmth and inspect perfusion.
Assess renal, spinal, pelvic and genital anomalies; urgent paediatric urology/orthopaedic referral for staged reconstruction.

Hypospadias

Hypospadias is a ventral urethral opening proximal to the normal tip, often with incomplete foreskin and chordee. Classify by meatal position but also record curvature, penile size and testes.

Do not circumcise: foreskin may be needed for reconstruction. Severe proximal hypospadias with bifid scrotum or undescended testes may indicate a difference of sex development and requires urgent specialist assessment before sex assignment decisions or surgery.

Most repairs are performed in infancy by paediatric urology. Preoperative care is protection and counselling, not dilation. After repair maintain prescribed catheter/stent, double-diaper if directed, give analgesia/antispasmodic medicines as prescribed and observe urine flow, bleeding, infection, fistula or wound breakdown.

Undescended Testis and Hydrocele

Cryptorchidism is failure of one/both testes to reach the scrotum. Distinguish from a retractile testis and document whether palpable. Bilateral non-palpable testes, especially with atypical genitalia, require urgent endocrine/genetic review. Persistent undescended testis is referred early for orchidopexy during infancy according to surgical guidance to protect fertility and facilitate later cancer surveillance; hormonal/surgical decisions are specialist-led.

A simple communicating hydrocele is a fluid collection around the testis that may vary in size. Many infant hydroceles resolve; persistent, tense or associated inguinal hernia needs surgery. Acute painful swelling is not assumed to be hydrocele—exclude torsion or incarcerated hernia urgently.

Differences/Disorders of Sex Development

Atypical genital development may result from chromosomal, gonadal or hormonal conditions. Congenital adrenal hyperplasia can cause life-threatening salt-wasting.

Immediate priorities

Use neutral, respectful language; do not guess sex, stigmatise or repeatedly expose the infant for examination.
Assess ABC, hydration, weight, glucose, sodium, potassium and acid–base status. Vomiting, weight loss, dehydration, hyponatraemia, hyperkalaemia or shock requires emergency endocrine treatment.
Do not perform irreversible genital surgery or rushed sex assignment. Refer to neonatology, endocrinology, genetics, urology and psychology/ethics services.
Investigations may include karyotype/genetic tests, 17-hydroxyprogesterone and other hormones, pelvic/renal ultrasound and targeted electrolyte monitoring.
Support parents with clear updates and confidentiality while diagnostic information is gathered.

Nursing Management

Priority	Specific intervention	Rationale
Urine/renal monitoring	Record time of first urine, every void/catheter output, stream, colour, daily weight, BP and fluid balance.	Detects obstruction, renal failure and post-obstructive diuresis.
Electrolytes	Observe vomiting, dehydration, weakness/arrhythmia; collect prescribed samples and administer corrected fluids/medicines accurately.	Obstruction, renal failure and adrenal crisis can rapidly cause fatal electrolyte change.
Catheter care	Secure without traction, maintain closed drainage, avoid kinks, provide meatal hygiene and report falling output or leakage.	Ensures decompression and reduces trauma/infection.
Exposed bladder	Maintain moist sterile non-adherent cover; avoid pressure and contamination.	Prevents drying, bleeding and infection.
Infection	Use asepsis, obtain urine correctly before antibiotics when feasible, monitor temperature/perfusion and administer prescribed therapy.	UTI can progress to sepsis and scar developing kidneys.
Family support	Explain condition without blame, protect privacy and teach medicines, catheter/wound care and danger signs.	Promotes dignity and safe long-term care.

Complications and Follow-up

Recurrent UTI, pyelonephritis, renal scarring, hypertension and chronic kidney disease.
Electrolyte crisis, bladder dysfunction, incontinence and impaired growth.
Infertility, sexual/urinary functional problems and psychosocial distress.
Surgical complications: fistula, stenosis, obstruction, wound infection and need for staged revision.

Follow-up is lifelong when renal/bladder dysfunction exists: growth, BP, urinalysis, creatinine/electrolytes, ultrasound, bladder function, continence, puberty/fertility and psychosocial support.

Revision Questions

Classify CAKUT and explain the assessment of antenatal hydronephrosis.
Describe emergency management of posterior urethral valves.
Explain why circumcision is contraindicated in hypospadias.
Outline immediate nursing care for bladder exstrophy.
Describe the emergency assessment of atypical genital development.

References

Fluid prescriptions, electrolyte correction, antibiotics, endocrine treatment and surgical timing must follow current specialist and Uganda/facility protocols.