Fetal MRI in experimental tracheal occlusion

Area of Science:

• Fetal Medicine
• Pediatric Surgery
• Medical Imaging

Background:

• Congenital diaphragmatic hernia (CDH) is a severe condition with high mortality, primarily due to pulmonary hypoplasia and pulmonary hypertension.
• Prenatal tracheal occlusion (TO) is a surgical intervention to promote lung growth in fetuses with severe CDH.
• Accurate prenatal diagnosis and monitoring are crucial for identifying high-risk fetuses and assessing the effectiveness of TO.

Purpose of the Study:

• To evaluate the role of prenatal imaging in identifying fetuses with CDH who would benefit from TO.
• To assess the utility of ultrasound (US) and magnetic resonance imaging (MRI) in monitoring fetal lung growth after TO.
• To compare the diagnostic capabilities of US and MRI in evaluating CDH and its associated lung hypoplasia.

Main Methods:

• Review of prenatal imaging techniques, including ultrasound (US) and magnetic resonance imaging (MRI), for CDH assessment.
• Discussion of the limitations of US and the advantages of MRI in evaluating liver herniation and lung volumes.
• Assessment of fetal lung growth in sheep models using cross-sectional US measurements following initial MRI lung volume determination.

Main Results:

• Ultrasound is the primary imaging modality for CDH due to its availability and cost-effectiveness.
• MRI offers superior tissue contrast, aiding in the diagnosis of high-risk CDH fetuses by evaluating liver herniation and determining absolute lung volumes.
• Both MRI and US were found to be useful in monitoring fetal lung growth after prenatal TO in a sheep model.

Conclusions:

• Prenatal imaging, particularly MRI, is essential for identifying fetuses with CDH who may benefit from TO.
• Combined use of MRI and US can effectively monitor fetal lung development and the impact of TO.
• These imaging modalities are critical for optimizing management strategies in fetuses diagnosed with CDH.