Prenatal Megacystis - Is Prediction of Outcome and Renal Function Possible?

Area of Science:

• Perinatal medicine
• Fetal medicine
• Medical imaging

Background:

• Fetal megacystis, characterized by an enlarged fetal bladder, presents diagnostic and management challenges.
• Accurate prenatal prognostication is crucial for parental counseling and guiding clinical decisions.

Purpose of the Study:

• To evaluate prenatal prognostic factors for fetuses diagnosed with megacystis.
• To establish criteria for parental counseling and potential fetal interventions.

Main Methods:

• Retrospective observational study of 53 fetuses with megacystis.
• Analysis of fetal karyotype, amniotic fluid volume, and fetal urine biochemistry (beta-2 microglobulin, osmolarity, chloride).
• Logistic regression and ROC curve analysis to determine predictive values.

Main Results:

• Reduced amniotic fluid volume was significantly associated with impaired renal function or perinatal death (p=0.0027).
• Fetal urine beta-2 microglobulin demonstrated perfect discrimination (AUC=1.0) between survivors and non-survivors.
• Fetal urine osmolarity (AUC=0.81) and chloride (AUC=0.76) also showed significant predictive value.

Conclusions:

• Prenatal assessment should incorporate fetal karyotyping, amniotic fluid assessment, and fetal urine biochemistry.
• Gestational age-dependent regression lines derived from these parameters offer clinically relevant discrimination.
• These criteria can guide selection for fetal interventions and enhance parental counseling accuracy.