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Subnormal cerebellum in fetuses with spina bifida
12nd Department of Obstetrics and Gynecology, University of Bologna School of Medicine, Italy.
American Journal of Obstetrics and Gynecology
|May 1, 1988
Summary
Prenatal ultrasound can detect spina bifida by examining posterior fossa structures. Key indicators include a small cerebellar diameter and an obliterated cisterna magna, aiding in early diagnosis.
Area of Science:
- Medical imaging
- Fetal medicine
- Neurology
Background:
- Spina bifida is a complex neural tube defect.
- Accurate prenatal diagnosis is crucial for management.
- Ultrasound assessment of fetal posterior fossa structures is evolving.
Purpose of the Study:
- To evaluate the utility of posterior fossa ultrasound in diagnosing spina bifida.
- To identify specific ultrasound markers for spina bifida in the posterior fossa.
- To differentiate spina bifida from isolated hydrocephalus using posterior fossa imaging.
Main Methods:
- Prospective ultrasound study.
- Inclusion of 19 fetuses diagnosed with spina bifida.
- Comparison with a control group of 17 fetuses with isolated hydrocephalus.
- Detailed assessment of posterior fossa structures, including cerebellar diameter and cisterna magna.
Main Results:
- All 19 fetuses with spina bifida demonstrated a transverse cerebellar diameter below normal limits.
- The cisterna magna was obliterated in all fetuses with spina bifida.
- These posterior fossa abnormalities were not observed in the control group with isolated hydrocephalus.
- Decreased cerebellar size and visualization failure were specific to spina bifida.
Conclusions:
- Ultrasound examination of the posterior fossa is a valuable tool for the prenatal diagnosis of spina bifida.
- Specific findings like reduced cerebellar size and absent cisterna magna are strong indicators.
- This imaging approach can help distinguish spina bifida from other conditions like hydrocephalus.