A RECENT study has demonstrated that intrauterine foetoscopic repair of spina bifida significantly improves foetal brain edema and hindbrain herniation, although some postoperative risks persist. The findings, presented by Maximilian Schulze and colleagues, highlight the critical role of MRI in assessing surgical outcomes and guiding follow-up strategies.
Neural tube defects such as myelomeningocele (MMC) and rachischisis are commonly associated with secondary central nervous system changes, including hindbrain herniation, oedema, and aqueductal obstruction. While prenatal surgical repair aims to mitigate these complications, detailed postoperative imaging data have been limited.
The team conducted a retrospective analysis of 31 patients with MMC (n=18) or rachischisis/myelocele (n=13) using pre- and postoperative foetal MRI. Key parameters included atlanto-occipital membrane bulging, extracerebral space size, brain oedema, aqueductal patency, and cavum septum pellucidum (CSP) integrity.
Foetal MRI Shows Brain Edema Reduction After Spina Bifida Repair
Before surgery, 71% of patients showed atlanto-occipital bulging, 68% demonstrated brain oedema, and 74% had aqueductal stenosis. Postoperatively, bulging and oedema decreased dramatically to 16% each (McNemar p < 0.001), while extracerebral space increased from 3.1 mm to 8.2 mm. Despite these improvements, 39% of cases continued to show aqueductal obstruction, and CSP abnormalities persisted or worsened in some patients.
A very strong correlation was observed between postoperative hindbrain herniation and brain oedema (r ≈ 0.94; Chi² p = 0.0005), underscoring the link between these structural changes.
Study Highlights Role of Imaging in Tailored Foetal Management
The study highlights that foetoscopic repair is effective in alleviating brain oedema and hindbrain bulging in utero, but ongoing aqueductal obstruction and CSP changes indicate the need for careful MRI follow-up. These imaging findings may inform personalised management strategies and help anticipate potential postoperative complications.
Limitations include the study’s retrospective design and absence of clinical outcome data, such as neurodevelopmental function. Nevertheless, the findings provide valuable radiological insights into the benefits and residual risks of prenatal spina bifida repair.
Reference
Schulze M et al. Impact of intrauterine fetoscopic spina bifida repair on foetal brain edema. ECR Congress. 4-8 March, 2026.
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