Acardiac Monster

A type of twinning in which there is circulatory reversal through various interplacental anastomoses in a diamnionic-monochorionic placenta; the range of expression is extreme, from complete lack of limbs to excess limbs; usually the umbilical artery is single and the twins are of the same sex
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Foetus in foetu and acardiac monster: can the similar patterns of these two malformations be explained by a common morphological mechanism?