malformation

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The kitten in this photograph has diprosopia, a rare congenital malformation that duplicates facial features.
这张照片中的小猫所示的双面畸形，是一种罕见的先天性畸形，面部特征重复。
That "might be a useful tool" for figuring out the cause of a disease, malformation, or even a behavioral trait.
那“可能是找出疾病病因、畸形或某种行为特征的有效手段”。
The main problem is the nature of their malformation: the maids have usually been represented as being conjoined both at the shoulder and at the hip and are depicted as such on all known moulds.
最主要的问题是她们身体畸形的性质如何：姐妹二人的形象是在胯部和肩膀处都有连接，并且所有的已知模具上都是这样刻画的。

The condition involves a kind of tangle in the brain called an arteriovenous malformation, or AVM.
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the condition of being wrongly formed, or a part of something, such as part of the body, that is wrongly formed

A malformation in a person's body is a part which does not have the proper shape or form, especially when it has been like this since birth.