The sonolucent placenta in high-risk obstetrics

Area of Science:

• Obstetrics and Gynecology
• Medical Imaging
• Fetal Medicine

Background:

• Placental sonolucency is a recognized ultrasound finding.
• Previous reports suggest it is normal after 36 weeks' gestation.

Purpose of the Study:

• To investigate placental sonolucency in vitro.
• To correlate sonolucency with placental anatomy and pathology.
• To assess its association with pregnancy outcomes.

Main Methods:

• In vitro sonographic imaging of 15 human placentas.
• Xerography and pathological examination of placental tissues.
• Correlation of sonolucent areas with cotyledons and calcification.

Main Results:

• Sonolucency was observed as early as 31 weeks' gestation.
• Sonolucent areas corresponded anatomically to placental cotyledons.
• Degree of sonolucency correlated with septal calcification.
• 80% of patients with sonolucent placentas experienced adverse outcomes like intrauterine growth retardation or fetal death.

Conclusions:

• Placental sonolucency may occur earlier than previously thought.
• It is linked to placental calcification.
• Sonolucency in high-risk pregnancies may indicate a higher risk of adverse fetal outcomes.