Prenatal sonographic features of fetuses in trisomy 13 pregnancies (I)

Area of Science:

• Medical Imaging
• Prenatal Diagnosis
• Genetics

Background:

• Trisomy 13 (Patau syndrome) is a severe chromosomal disorder.
• Early and accurate diagnosis is crucial for genetic counseling and management.
• Prenatal ultrasound is a key diagnostic modality.

Purpose of the Study:

• To comprehensively review prenatal sonographic features of trisomy 13.
• To highlight major and subtle abnormalities across trimesters.
• To aid in the early detection of trisomy 13.

Main Methods:

• Literature review of studies on prenatal sonographic findings in trisomy 13.
• Compilation of first-trimester abnormalities (omphalocele, holoprosencephaly, megacystis, heart defects).
• Analysis of reported second- and third-trimester sonographic features and subtle findings.

Main Results:

• First-trimester ultrasound can identify major structural defects in trisomy 13.
• Subtle second-trimester findings include echogenic intracardiac foci, echogenic bowel, and single umbilical artery.
• Intrauterine growth restriction and choroid plexus cysts are also noted.

Conclusions:

• Prenatal ultrasound is vital for detecting trisomy 13 structural abnormalities.
• Recognizing a spectrum of sonographic findings improves diagnostic accuracy.
• Comprehensive ultrasound assessment aids in timely diagnosis and counseling.