Elmore SA, Cochran RZ, Bolon B, et al. Histology atlas of the developing mouse placenta. Toxicologic Pathology. 2022; 50(1):60-117. doi: 10.1177/01926233211042270
The authors wish to correct a minor terminology error in the legend for Figure 45 on page 113. The area of fusion between the two placentas occurs between the junctional zones of each placenta rather than between their chorions. Accordingly, the corrected figure legend should read:
Figure 45. Example of twinning with a fused placenta at E15.5. A, Gross image of twin embryos sharing a fused placenta. The embryo shown on the right is slightly smaller and paler than its counterpart on the left. B, Low magnification of twin embryos sharing a fused placenta supporting two sets of umbilical arteries (UA). C, Higher magnification of fused placenta and separate uterine arteries with a clear border (arrows) between the two placentas where there is junctional zone fusion. Note the disorganization of the placenta associated with the right embryo. Intertwin growth discrepancy is a common finding and is likely due to differential nutrient exchange, oxygen supply, and waste removal within the respective placentas.
The online version of this article has been updated.
