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🔬 HYPOSPADIAS - Complete Exam Guide for Plastic Surgery

Sources: Campbell-Walsh Urology (5th Ed), Bailey & Love's Surgery (28th Ed), Hinman's Atlas of Urologic Surgery, The Developing Human (Moore & Persaud), Schwartz's Principles of Surgery

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1. DEMOGRAPHY & EPIDEMIOLOGY

Exam crux: Hypospadias is the MOST COMMON congenital urethral anomaly. Glanular type = MOST COMMON. Perineal = LEAST COMMON but MOST SEVERE.

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2. EMBRYOLOGY & PATHOGENESIS

• Urethral folds fuse in the midline (ventral) under androgen stimulation between weeks 8-16 of gestation
• The spongy (penile) urethra forms by fusion of urethral folds
• The glanular urethra forms separately by canalization of the ectodermal cord
• Complete development depends on testosterone and its conversion to DHT (5-alpha reductase)

• Failure of canalization of the ectodermal cord in the glans (→ glanular hypospadias)
• Failure of fusion of the urethral folds (→ penile/proximal hypospadias)
• Both mechanisms together → complete ventral hypoplasia with chordee

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3. ETIOLOGY

Genetic Factors

• Polygenic/multifactorial inheritance pattern
• Associated genes: SRD5A2 (5-alpha reductase 2), AR (androgen receptor), ATF3, MAMLD1, FGF8, FGF10, BMP7, MID1, CXorf6
• Monozygotic twins: 18% concordance (not 100% → environmental component)
• Family history present in ~7-10% of cases

Hormonal/Endocrine Factors

• Inadequate androgen production by fetal testes
• Inadequate androgen receptor sensitivity (partial androgen insensitivity)
• 5-alpha reductase deficiency → inability to convert T → DHT
• Maternal progestagen/estrogen exposure during pregnancy

Environmental Factors (Endocrine Disruptors)

• Pesticides (DDT, DDE, vinclozolin) - anti-androgenic
• Phthalates (plastics industry)
• Phytoestrogens (soy-based foods)
• Maternal obesity, preeclampsia, placental insufficiency
• ART (Assisted Reproductive Techniques) - doubles the risk
• Low birth weight / prematurity

Associated Conditions (exam favourite!)

EXAM KEY: If perineal hypospadias + bilateral cryptorchidism + micropenis → ALWAYS investigate for DSD/intersex

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4. CLINICAL FEATURES - THE TRIAD

Note: In mild distal cases, chordee may be absent. The meatus + hooded foreskin may be the only findings.

Additional Features

• Incomplete foreskin (dorsal hood)
• Bifid scrotum (severe cases)
• Penoscrotal transposition (severe cases)
• Urethral dimple / blind pit at normal meatal site
• Downward deflection of urinary stream
• Spraying of urine (40-50%)
• Post-void dribbling (20-40%)

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5. CLASSIFICATION

Anatomical / By Meatal Position (Most Used)

Simplified Clinical Classification

Barcat Classification (for severity)

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6. CLINICAL PHOTOGRAPHS

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7. INVESTIGATIONS

When to Investigate?

• Diagnosis is purely clinical - NO investigations needed routinely
• Physical examination is sufficient

Specific Investigations Table

When NOT to Investigate

• Distal glanular or coronal hypospadias with no associated anomalies - no workup needed
• Isolated hypospadias without ambiguous genitalia or cryptorchidism - clinical diagnosis only

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8. PREOPERATIVE CONSIDERATIONS

Key Rules Before Surgery

1. NEVER CIRCUMCISE a child with hypospadias - preputial skin is the most valuable graft material
2. Correct age: 6-18 months is the optimal window (before toilet training, penile development)
3. Most surgeons prefer 6-12 months
4. Anesthetic risk is acceptable after 6 months
5. Magnification (2.5x-3.5x loupes or operating microscope) is mandatory
6. Preoperative testosterone cream/DHT cream (topical) for 4-6 weeks may enlarge a small phallus
7. Assess: meatal position, urethral plate quality, degree of chordee, foreskin amount

Hormonal Priming (Preoperative)

• Topical DHT or testosterone applied for 4-6 weeks pre-op
• Used for small phallus or in proximal cases
• Systemic HCG or testosterone for severe micropenis
• A 2024 systematic review (PMID 38739164) confirmed benefit of topical estrogen / hormone priming in hypospadias management

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9. SURGICAL PRINCIPLES - GOALS OF REPAIR

1. Orthotopic meatus - vertical slit at tip of glans
2. Straight penis - correction of chordee
3. Normal voiding - forward, non-deflected stream
4. Cosmetically normal appearance
5. Normal sexual function in adulthood
6. Low complication rate - fistula rate <5% is the benchmark

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10. SURGICAL TECHNIQUES

OVERVIEW: Which technique for which type?

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A. MAGPI (Meatal Advancement and Glanuloplasty Incorporated)

1. Transverse incision distal to meatus (Heineke-Mikulicz principle)
2. Close transversely to advance meatus distally
3. Dorsal skin bridge excised
4. Glanular wings approximated to create conical glans

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B. TIP REPAIR (Tubularized Incised Plate) - SNODGRASS

1. A - Circumscribing skin incision around hypospadiac meatus, preserving urethral plate
2. B - Penile degloving - skin retracted proximally, chordee assessed
3. C - Deep midline incision of urethral plate to underlying corporal bodies (the KEY step - widens the plate)
4. D - Tubularization - plate rolled into tube over catheter using 7-0 PDS running sutures; first stitch ~3mm proximal to meatal end (creates oval opening)
5. E - Dartos flap cover - pedicled dartos/subcutaneous flap interposed between neourethra and skin (reduces fistula risk - WATERPROOFING LAYER)
6. F - Glansplasty - glans wings approximated over neourethra creating neo-meatus at tip
7. G - Skin closure + circumcision or preputioplasty

• Most cosmetically normal meatus (vertical slit)
• Single-stage
• No graft/flap needed in distal cases
• 90%+ used for distal hypospadias in surveys

• Requires a GOOD, flat, wide urethral plate
• If plate is narrow/stenotic → risk of meatal stenosis
• Long TIP repair (penoscrotal) → HIGH RESISTANCE neourethra → prolonged voiding, poor flow
• Not ideal for proximal hypospadias with severe chordee

• Severe chordee requiring urethral plate division
• Very narrow or scarred urethral plate
• Redo cases with scarred tissues

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C. MATHIEU (FLIP-FLAP) REPAIR

1. Parameatal-based proximal flap raised (equal in length to deficient urethra)
2. Flap FLIPPED (rotated 180°) onto ventral glans over urethral plate
3. Flap and plate edges sutured together distally
4. Creates neo-meatus at tip

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D. ONLAY ISLAND FLAP (OIF) / DUCKETT

1. Inner preputial skin island flap raised on vascular pedicle (dartos)
2. Flap transposed ventrally and sutured as an ONLAY onto the retained urethral plate (augments width)
3. Glansplasty performed

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E. TRANSVERSE PREPUTIAL ISLAND FLAP (TPIF) / DUCKETT TUBE

1. Penile degloving + artificial erection to assess curvature
2. Transverse preputial inner skin island harvested on dartos pedicle
3. Island flap TUBULARIZED into a neourethra
4. Anastomosed to native proximal urethra
5. Transposed ventrally through buttonhole in pedicle
6. Glansplasty completed

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F. TWO-STAGE REPAIR (BRACKA / BYARS)

1. Full penile degloving
2. Chordee correction - division of urethral plate + division of fibrous tissue
3. Multiple ventral corporotomies if needed (corporal lengthening)
4. BRACKA: Buccal mucosa graft (BMG) or inner prepucial graft laid on ventral surface and quilted
5. BYARS: Dorsal prepucial skin transposed ventrally as pedicled flaps sutured in midline
6. Penis allowed to heal for minimum 6 months

1. U-shaped (Thiersch-Duplay) incision around neourethral template
2. Tubularize the graft/flap into neourethra over catheter
3. Multilayer closure with dartos cover
4. Glansplasty

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G. THIERSCH-DUPLAY TUBULARIZATION

• U-incision around urethral plate
• Plate edges rolled into tube over catheter
• Closed in 2 layers with dartos cover
• Glansplasty

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H. BUCCAL MUCOSA GRAFT (BMG)

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11. CHORDEE CORRECTION

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12. POSTOPERATIVE CARE

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13. COMPLICATIONS

Most Common Complication: Urethrocutaneous Fistula (~10%)

Most common complication = Urethrocutaneous Fistula Most common site of fistula = at original meatal site or coronal margin

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14. INDICATIONS / CONTRAINDICATIONS / TIMING SUMMARY

Indications for Surgery

• All hypospadias except the most minor glanular type
• Functional: poor urinary stream direction, spraying, incomplete emptying
• Cosmetic: abnormal penile appearance
• Psychological: normal appearance for peer development
• Sexual: to enable normal penetrative intercourse

When NOT to Operate

• Isolated minor glanular hypospadias with normal meatus caliber and no chordee (relative)
• Very small phallus → operate only after hormonal priming
• Active local infection
• Before 6 months of age (anesthetic risk)
• In a major syndromic child where surgery adds undue risk

TIMING - Optimal Window

• 6-18 months is universally accepted optimal window
• Before toilet training (typically before 2 years)
• Before psychological awareness of genital differences (~18 months)
• NEVER circumcise before repair

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15. KEY EXAM FLOWCHART - MANAGEMENT OF HYPOSPADIAS

NEWBORN MALE → CLINICAL DIAGNOSIS (Ventral meatus + Hooded foreskin + Chordee)
                        ↓
         ┌──────────────┴──────────────┐
    DISTAL (70%)                 PROXIMAL (30%)
    Glanular/Coronal              Penoscrotal/Perineal
         │                               │
    No workup needed         INVESTIGATE:
                             • Karyotype
                             • Hormone panel
                             • Pelvic USS
                             • Rule out DSD
         │                               │
         ↓                               ↓
  AVOID CIRCUMCISION ←──── In ALL cases ────→ AVOID CIRCUMCISION
         │                               │
         ↓                               ↓
  Hormonal priming             Hormonal priming
  if small phallus              MANDATORY
         │                               │
         ↓                               ↓
   OPERATE AT 6-18 months        OPERATE AT 6-18 months
         │                               │
         ↓                               ↓
   Good urethral plate?          Good urethral plate?
   Minimal chordee?              Severe chordee?
         │                               │
         ↓                               ↓
   TIP (SNODGRASS) ← GOLD STANDARD    Two-Stage Repair
   [90% of distal repairs]            (Bracka BMG or Byars)
         │                               │
   If OIF needed (proximal           Stage 1: Chordee correction
   but plate OK): ONLAY FLAP         + graft/flap placement
         │                             (wait 6 months)
         ↓                               │
   POST-OP:                          Stage 2: Tubularization
   Catheter 7-10 days                + Glansplasty
   Antibiotics prophylaxis
   Uroflowmetry at follow-up
         │
         ↓
   COMPLICATION? (10% fistula, 5-10% stenosis)
         │
         ↓
   Wait 6 months → Redo/Fistula closure
   (Buccal mucosa graft for major redo)

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16. CRISP POINT SUMMARY (Exam Crux)

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• Topical estrogen/hormone priming systematic review 2024 - supports pre-op hormonal priming for small phallus (PMID: 38739164)
• Oral mucosa graft outcomes 2025 - confirms good post-pubertal outcomes for buccal mucosa urethral reconstruction (PMID: 39945907)
• Platelet-rich plasma in hypospadias repair meta-analysis 2026 - emerging adjunct to reduce fistula risk (PMID: 42001334)
• TIP repair: interrupted vs continuous sutures meta-analysis 2026 - interrupted sutures may have lower fistula rate (PMID: 42240839)

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• Cover page with a professional gradient design
• All 18 sections with colour-coded headers
• All clinical photographs and surgical diagrams from Campbell-Walsh, Bailey & Love, and Hinman's Atlas
• All tables (demography, classification, investigations, complications, recent evidence)
• Surgery technique cards with step-by-step numbered steps for TIP, MAGPI, Mathieu, OIF, TPIF, Two-stage, and BMG
• Management flowchart (text-based, clearly laid out)
• Top 20 crisp exam points with numbered bubbles
• Recent 2024-2026 PubMed evidence table