Posterior urethral valves (PUV) are the most common cause of severe obstructive uropathy in male neonates. The Young-Dees classification (Types I–III) recognizes which type as the most common?
- A Type I — valves arising from the verumontanum and extending to the lateral walls of the urethra ✓
- B Type II — valves running toward the bladder neck (not obstructive)
- C Type III — ring-like membrane at the level of the verumontanum with a central opening
- D Type I and III equally common
Correct answer: A. Type I — valves arising from the verumontanum and extending to the lateral walls of the urethra
Explanation
Young-Dees Type I PUV accounts for approximately 95% of all posterior urethral valves. These are two sail-like leaflets arising from the verumontanum and fusing anterolaterally, with the posterior commissure attached to the verumontanum. They obstruct the posterior urethra during voiding. Type III (less common, ~5%) is a diaphragm-like membrane. Type II is now considered a normal variant and not truly obstructive. Treatment is endoscopic valve ablation (primary ablation) via cystoscopy in neonates once stabilized.
Reference: Bailey & Love's Short Practice of Surgery, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.