Echogenic material in the fetal gallbladder: sonographic and clinical observations.

Obstetric sonograms of 26 fetuses with echogenic material in the gallbladder were reviewed to describe the sonographic findings and clinical significance. Gestational age at the time of diagnosis ranged from 28 to 42 weeks (mean, 36.2 weeks). The echogenic foci were associated with distal shadowing in eight fetuses (30%), comet-tail artifact in nine (35%), and no distal artifact in nine (35%). No hemolytic anemias, other predisposing risk factors, or clinical sequelae associated with biliary tract disease were identified in any of the infants. Postnatal sonographic or pathologic follow-up studies were available in 17 cases. In nine of these 17 infants, the echogenic foci had resolved. In three, the foci have persisted, but none of the children have become symptomatic; the longest period of follow-up with stones still present is 4 1/2 years. Whether all echogenic foci in the fetal gallbladder represent true gallstones remains unknown. Echogenic foci may be seen in the fetal gallbladder during the third trimester. No predisposing fetal risk factors or clinical sequelae were evident in our series. Many echogenic foci, but not all, will resolve.