Nonvisualization of the fetal gallbladder: frequency and prognostic importance

Area of Science:

• Medical Imaging
• Fetal Medicine
• Obstetrics

Background:

• Fetal gallbladder visualization during prenatal ultrasound is a developing area of diagnostic interest.
• Understanding the typical appearance and detection rates of the fetal gallbladder throughout gestation is crucial.

Purpose of the Study:

• To evaluate the frequency of fetal gallbladder detection across different gestational ages.
• To ascertain the prognostic significance of a nonvisualized fetal gallbladder.

Main Methods:

• Prospective ultrasound examinations were conducted on 578 fetuses in the second and third trimesters.
• Gallbladder visualization data were analyzed based on estimated gestational age.
• Postnatal follow-up was performed for 80 fetuses where the gallbladder was not visualized.

Main Results:

• The fetal gallbladder was visualized in 82.5% (477/578) of examinations.
• Visualization rates increased with gestational age, peaking at approximately 95% between 24-32 weeks, then declining.
• Of 80 fetuses with nonvisualized gallbladders, 75 had normal outcomes; abnormalities were minor and unrelated to the biliary system.

Conclusions:

• The majority of fetuses with a nonvisualized gallbladder exhibit normal development.
• The high incidence of nonvisualization limits its usefulness as a screening tool for fetal anomalies.