Congenital defect - Atlas of swine pathology
![](https://www.pig333.com/3tres3_common/atlas/web/congenital-defect_252.jpg)
Where: other
Possible causes: Other
Siamese twins may be joined only superficially, or may share most of their organs. As with identical twins, siamese twins result from the fertilisation of a single egg cell, but with siamese twins the division is incomplete.