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[Application of chromosomal microarray analysis for fetuses with choroid plexus cysts].

Keqin Jin1, Jun Zhang, Xiayuan Xu

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Summary

Chromosomal microarray analysis (CMA) enhances detection of fetal chromosomal abnormalities in fetuses with choroid plexus cysts (CPC). This method, combined with karyotyping, improves genetic counseling for these pregnancies.

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Area of Science:

  • Prenatal diagnosis
  • Medical genetics
  • Fetal ultrasonography

Context:

  • Choroid plexus cysts (CPC) are common ultrasonographic findings in fetuses.
  • The association between CPC and chromosomal abnormalities necessitates accurate diagnostic methods.
  • Prenatal ultrasonography identifies CPC, prompting further genetic evaluation.

Purpose:

  • To evaluate the diagnostic utility of chromosomal microarray analysis (CMA) for fetuses presenting with choroid plexus cysts (CPC) identified via prenatal ultrasound.
  • To compare the detection rates of CMA versus traditional chromosomal karyotype analysis in fetuses with CPC.
  • To determine the value of CMA in identifying copy number variations (CNVs) in fetuses with isolated and non-isolated CPC.

Summary:

  • A study of 104 fetuses with CPC found that CMA detected additional copy number variations (CNVs) beyond standard karyotype results.
  • The detection rate for chromosomal abnormalities was significantly higher with CMA, particularly in fetuses with non-isolated CPC (47.1%) compared to isolated CPC (4.6%).
  • Abnormal CMA findings in fetuses with CPC were associated with other fetal anomalies like single umbilical artery and cardiac defects.

Impact:

  • Chromosomal microarray analysis (CMA) significantly improves the detection of fetal chromosomal abnormalities in cases of choroid plexus cysts (CPC).
  • Combining CMA with karyotype analysis provides a more comprehensive genetic assessment, crucial for informed genetic counseling.
  • This enhanced diagnostic capability aids in better risk assessment and management strategies for pregnancies with fetal CPC.