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Complete trisomy 9 in a term fetus: a case report

D Roshanfekr¹, C Dahl-Lyons, E Pressman

¹Department of Gynecology and Obstetrics, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.

The Journal of Maternal-Fetal Medicine

|October 17, 1998

Summary

Complete trisomy 9, a genetic disorder, was diagnosed in a fetus. The pregnancy resulted in stillbirth despite no other detected fetal abnormalities besides a two-vessel umbilical cord and growth restriction.

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Area of Science:

Genetics
Prenatal Diagnosis
Fetal Medicine

Background:

Trisomy 9 is a rare chromosomal abnormality.
Accurate prenatal diagnosis is crucial for genetic counseling and management.
Fetal growth restriction and single umbilical artery are common findings in complicated pregnancies.

Observation:

A 35-week fetus was diagnosed with complete trisomy 9 via amniocentesis.
Prenatal sonograms identified a two-vessel umbilical cord and intrauterine growth restriction.
No other significant fetal anomalies were detected during prenatal imaging.

Findings:

Complete trisomy 9 was confirmed as the sole diagnosis.
The fetus experienced intrauterine growth restriction and had a two-vessel cord.

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The pregnancy concluded with a stillbirth at 37 weeks gestation.

Implications:

This case highlights the challenges in predicting pregnancy outcomes solely based on ultrasound findings.
Complete trisomy 9 can lead to adverse pregnancy outcomes, including stillbirth.
Further research into the specific impact of trisomy 9 on fetal development and survival is warranted.