Enlarged fetal bladder: Differential diagnosis and outcomes

Area of Science:

• Perinatology
• Fetal Medicine
• Pediatric Urology

Background:

• Enlarged fetal bladder (fetal megacystia) can be a transient finding or indicate underlying pathology.
• Potential causes include reflux, obstruction, neurogenic, or myopathic conditions.
• Accurate diagnosis is essential for appropriate management and predicting outcomes.

Purpose of the Study:

• To present three distinct cases of fetal megacystia with different etiologies.
• To highlight the diagnostic challenges and management considerations for enlarged fetal bladders.
• To emphasize the importance of comprehensive evaluation and monitoring.

Main Methods:

• Case series review of three fetuses diagnosed with enlarged bladders.
• Sonographic evaluation of fetal urinary tract, genitalia, and spine.
• Postnatal assessment and diagnostic workup based on initial findings.

Main Results:

• Case 1: Posterior urethral valve obstruction.
• Case 2: Ruptured neurogenic bladder.
• Case 3: Megacystic-microcolon-intestinal hypoperistalsis syndrome.
• Sonography identified abnormalities but specific causes varied.
• Monitoring for persistent enlargement and amniotic fluid changes is recommended.

Conclusions:

• Enlarged fetal bladder requires thorough sonographic assessment of associated structures.
• While sonography detects abnormalities, definitive diagnosis often requires further investigation.
• Frequent monitoring and fetal electrolyte analysis aid in prognosis and therapeutic decisions.