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Korean Journal of Obstetrics & Gynecology 2005;48(11):2541-2549.
Published online November 1, 2005.
Factors Related with Intracranial Signs in Fetuses with Open Neural Tube Defect.
Gwang Jun Kim, Eun Sil Lee, Dong Ho Kim, Sang Hoon Lee, Jung Duck Park, Mi Hye Park
1Department of Obstetrics and Gynecology, Chungang University, Seoul, Korea. gjkim@cau.ac.kr
2Department of Preventive Medicine of Chungang University, Seoul, Korea.
3Department of Obstetrics and Gynecology of Ewha University, Seoul, Korea.
There are two types of spina bifida aperta: cystic type and flat type. Unruptured cystic sac of spina bifida may interfere free leakage of cerebrospinal fluid into amnionic fluid space. Therefore its presence could influence the appearance of the intracranial signs on prenatal ultrasound. The purpose of this study was to define the ultrasound findings causing the appearance of indirect intracranial signs. METHODS: Twenty-one fetuses with spina bifida were evaluated from Jan/1998 to March/2004. Incidence of indirect cranial signs (changes of ventricular width, morphologic change of cerebellum, obliteration of cisterna magna, decreased biparietal diameter and lemon sign) were evaluated according to gestational age at diagnosis, size, location and morphology of the spinal lesion. RESULTS: Meningeal sac was visible in 10 cases (48%), flat form in 11 cases (52%) on prenatal ultrasound. All of the intracranial signs seemed to appear more frequently on flat spina bifida, but there were no statistical significance. CONCLUSION: It seems like that the presence of the sac in spina bifida aperta did not interfere the appearance of intracranial signs on prenatal ultrasound.
Key Words: Intracrnial sign, Spina bifida, Meningeal sac
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