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Pathogenesis of megalourethra

F D Stephens1, D W Fortune

  • 1Department of Surgery, Royal Children's Hospital, Parkville, Victoria, Australia.

The Journal of Urology
|June 1, 1993
PubMed
Summary
This summary is machine-generated.

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Idiopathic megalourethra in infants may stem from delayed urethral canalization. This developmental delay in the glans can cause urethral obstruction and pendulous urethra enlargement in newborns.

Area of Science:

  • Pediatric Urology
  • Developmental Biology
  • Embryology

Background:

  • Idiopathic megalourethra is characterized by penile urethra enlargement without distal obstruction in infants.
  • The exact cause of this condition remains unclear, prompting further investigation into its embryological origins.

Observation:

  • Two aborted fetuses (14 and 19 weeks gestation) presented with megalourethra and complete distal urethral obstruction.
  • Histological examination revealed an uncanalized epithelial core within the glans penis, obstructing the urethral lumen.

Findings:

  • The epithelial core in the glans is a normal embryonic structure that typically canalizes early to ensure urethral continuity.
  • In the studied fetuses, arrested or delayed canalization of this core led to complete urethral obstruction and subsequent pendulous urethra dilation.

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Implications:

  • Delayed, rather than arrested, canalization of the glans epithelial core in surviving infants may be the underlying cause of idiopathic megalourethra.
  • Understanding this mechanism could lead to improved diagnostic and therapeutic strategies for congenital urethral anomalies.