2nd trimester ultrasound (anomaly).

Area of Science:

• Obstetrics and Gynecology
• Medical Imaging
• Fetal Medicine

Background:

• The second-trimester ultrasound is a cornerstone of prenatal care.
• It is typically performed between 18 and 24 weeks of gestation.
• This examination is critical for evaluating fetal anatomy, growth, and screening for mid-trimester anomalies.

Purpose of the Study:

• To provide a comprehensive overview of best practices and guidelines for second-trimester ultrasound.
• To emphasize the role of this scan in detecting fetal anomalies.
• To discuss factors influencing scan accuracy and limitations.

Main Methods:

• Review of established protocols for second-trimester ultrasound examinations.
• Assessment of key fetal structures and biometric parameters for growth evaluation.
• Evaluation of placental health, amniotic fluid levels, and cervical length for preterm birth risk.

Main Results:

• The ultrasound assesses fetal anatomy, estimates fetal weight via biometric measurements, and evaluates placental and amniotic fluid status.
• Cervical length measurement aids in assessing preterm birth risk.
• Operator skill, equipment quality, and maternal factors like obesity can impact scan accuracy.

Conclusions:

• The second-trimester ultrasound is an indispensable tool for pregnancy management, particularly in high-risk cases.
• Despite limitations in detection variability, it provides crucial screening and diagnostic information.
• Future advancements aim to enhance accuracy through improved technology, AI integration, and standardized protocols.