Posterior urethral valves

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[edit] Discussion of Posterior urethral valves

  • Posterior urethral valves are the most common congenital obstructive lesion of the urethra, occurring only in phenotypic boys.
  • Posterior urethral valves result from the formation of a thick, valvelike membrane from tissue of wolffian duct origin that courses obliquely from the verumontanum to the most distal portion of the prostatic urethra. The valve is a diaphragm, but because it is more rigid along its line of fusion, progressive distention during voiding causes it to become bilobed or sail-like.

[edit] Imaging Findings for Posterior urethral valves

[edit] VCUG

  • VCUG is the best imaging technique for the diagnosis of posterior urethral valves.
  • Radiologic findings include dilatation and elongation of the posterior urethra and, occasionally, a linear radiolucent band corresponding to the valve.
  • Vesicoureteral reflux occurs in 50% of patients.
  • Bladder trabeculation, hypertrophy, and diverticula are also demonstrated at VCUG (any cause of bladder outlet obstruction such as posterior urethral valves will cause bladder trabeculation or wall thickening).

[edit] US

[edit] Images

Patient #1

[edit] See Also

[edit] External Links

[edit] References for Posterior urethral valves