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The fetal central nervous system
1Swedish Hospital Medical Center, Seattle, WA.
Insights
Routine obstetric sonograms after the first trimester can improve detection of central nervous system (CNS) anomalies. Early recognition of cranial findings linked to spina bifida aids in identifying spinal defects before fetal viability.
Area of Science:
- Obstetrics and Gynecology
- Medical Imaging
- Fetal Medicine
Background:
- Central nervous system (CNS) anomalies are common congenital malformations.
- Early detection is crucial for fetal well-being and management.
- Current screening methods can be enhanced for improved accuracy.
Purpose of the Study:
- To emphasize the importance of systematic cranial and spinal surveys in obstetric sonograms.
- To highlight how recognizing cranial signs of spina bifida can improve early detection of spinal defects.
- To guide referral pathways for suspected fetal CNS anomalies.
Main Methods:
- Systematic sonographic survey of the cranium and spine.
- Post-first-trimester obstetric ultrasound examinations.
- Correlation of cranial findings with spinal anomalies, specifically spina bifida.
Main Results:
- A systematic survey of the cranium and spine improves detection rates of CNS anomalies.
- Characteristic cranial findings are associated with spina bifida, aiding in early diagnosis.
- Early detection is possible even in low-risk pregnancies.
Conclusions:
- Integrating systematic cranial and spinal evaluations into routine obstetric sonography enhances detection of fetal CNS anomalies.
- Early identification of spina bifida through cranial sonographic markers is feasible and clinically significant.
- Referral to tertiary centers is recommended for suspected cases for comprehensive evaluation and management.
Abstract:
CNS anomalies are some of the most common and clinically important congenital malformations encountered in utero. Improved detection of CNS anomalies requires a systematic survey of the cranium and spine as a part of all obstetric sonograms performed after the first trimester. Recognition of characteristic cranial findings associated with spina bifida can dramatically improve detection of small spinal defects before the time of fetal viability, even when the sonogram is performed for low-risk indications. Patients suspected to be carrying a fetus that has a cranial or spinal anomaly should ideally be referred to a tertiary center for confirmation of the defect, evaluation of possible additional anomalies, and for patient management and counseling.