Conus medullaris migration during the third trimester: A retrospective study.
Prenat Diagn
; 41(13): 1643-1648, 2021 Dec.
Article
em En
| MEDLINE
| ID: mdl-34687566
ABSTRACT
OBJECTIVE:
To explore the migration process of the conus medullaris (CM) and propose a normal range of CM levels during the third trimester.METHOD:
We retrospectively collected the ultrasonographic and clinical data of 588 fetuses during the third trimester. We located the CM and assigned scores. One-way analysis of variance and linear regression analyses were used to statistically analyze CM migration. Statistical significance was set at p < 0.05.RESULTS:
The CM levels were statistically different among the different gestational weeks of the third trimester. The CM level showed a linear regression correlation with the gestational weeks. On an average, the CM migrated from the top third of the L2 vertebra to the L1/2 intervertebral disc level.CONCLUSION:
The CM continues to migrate, from the top third of the L2 vertebra to the L1/2 intervertebral disc level, during the third trimester. The term infant could have the CM at the normal adult level at birth. At the beginning of the third trimester, a CM located above the L2/3 intervertebral disc level could be normal; the CM location at the L3 vertebra level could be physiological and needs follow-up; and a CM presenting below the L3 vertebra level might indicate tethered cord syndrome. The fetus with a CM significantly above the L1/2 intervertebral disc level may have caudal regression syndrome.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Terceiro Trimestre da Gravidez
/
Medula Espinal
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article