Most commonly when CPM is found it represents a trisomic cell line in the placenta and a normal diploid chromosome complement in the baby.
[3] CPM occurs in one of two ways: Several factors influence the pattern of normal and abnormal cells in the developing embryo.
It may be that sometimes the presence of significant numbers of abnormal cells in the placenta interferes with proper placental function.
[5] On the other hand, an apparently normal diploid fetus may experience problems with growth or development due to the effects of uniparental disomy (UPD).
[6] When predicting the likely effects (if any) of CPM detected in the first trimester, several potentially interactive factors may be playing a role, including: