Siamese
twins are identical twins who are
joined, usually at the hip, chest, abdomen, or head, and who may share some
organs. When both twins are relatively
normal, they are
termed symmetrical twins. When one child (the parasite) is underdeveloped and dependent on the normal child (the
host), they are termed asymmetrical twins. Often, parasites are surgically removed so that the healthy host can survive. Successful separation of symmetrical twins has been performed, but it has rarely been attempted when vital organs are shared. Chang and Eng (1811-74), the original Siamese twins, each eventually married although always joined, and fathered several children.
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