An X-ray, CT scan, MRI, or ultrasound assessment ... or dissimilar enough to be dizygotic. Observing physical features is really the main way to determine if twins are mirror twins.

Consequently, as a preliminary investigation of our hypothesis, we studied dizygotic twins (who are genetically distinct yet share the same uterine environment) with at least one of the pair ...

Identical (monozygotic) and fraternal (dizygotic) twins are the primary categories ... are paramount to mitigate these risks. Frequent ultrasounds, non-stress tests, and other monitoring ...