How accurately does current fetal imaging identify posterior fossa anomalies?

Area of Science:

• Neuroimaging
• Pediatric Radiology
• Fetal Medicine

Background:

• Posterior fossa anomalies are a group of congenital conditions affecting brain development.
• Fetal sonography is the initial diagnostic tool, but its accuracy can be limited.
• Fetal magnetic resonance imaging (MRI) offers improved visualization of the fetal brain.

Purpose of the Study:

• To determine the prevalence and spectrum of posterior fossa anomalies over five years.
• To evaluate the accuracy of fetal MRI in predicting postnatal MRI findings.
• To assess the diagnostic performance of fetal MRI compared to postnatal MRI.

Main Methods:

• Retrospective review of 90 cases with suspected fetal posterior fossa anomalies.
• Analysis of maternal, fetal, neonatal, and follow-up records.
• Comparison of fetal MRI findings with postnatal MRI results where available.

Main Results:

• Fetal MRI confirmed 67% of suspected posterior fossa anomalies.
• Complete agreement between fetal and postnatal MRI diagnoses occurred in 59% of cases.
• Discrepancies were noted in 41% of cases, with postnatal MRI excluding or revealing additional anomalies.

Conclusions:

• Fetal MRI is a useful adjunct to sonography for suspected posterior fossa anomalies.
• Current fetal MRI has limitations in accurately predicting postnatal abnormalities, especially in early gestation.
• Postnatal MRI follow-up is strongly recommended for suspected posterior fossa anomalies diagnosed by fetal MRI.