Variable expression of the congenital obstructive posterior urethral membrane

Area of Science:

• Pediatric Urology
• Urethral Anatomy and Physiology
• Congenital Urologic Abnormalities

Background:

• Membranous folds in the posterior urethra are a recognized cause of lower urinary tract obstruction in male infants and children.
• Variability in the presentation and severity of these folds necessitates a deeper understanding of their embryologic origins and clinical significance.

Purpose of the Study:

• To evaluate the spectrum of membranous folds within the posterior urethra.
• To determine the correlation between these urethral folds and the presence and severity of urethral obstruction.

Main Methods:

• Prospective endoscopic video recording analysis of 19 boys with posterior urethral membranous lesions over 2.5 years.
• Inclusion criteria comprised boys with prenatal diagnosis of obstructive uropathy or those presenting with urinary tract infection or hematuria.

Main Results:

• All patients with obstructive membranes exhibited Young's type I and type III appearances on endoscopy.
• Cases with less obstructive membranes were likely associated with incidental pathological findings, suggesting a spectrum of severity.

Conclusions:

• The congenital attachment of the verumontanum to the anterior urethral wall is proposed as the primary embryologic precursor to congenital posterior urethral obstruction.
• A variable degree of this attachment may persist, leading to non-obstructive or obstructive conditions in affected boys.