The term monster 'fetus acardius' is the one of the monozygotic twin who is greatly
malformed, reduced and has atrophied or rudimentary body component but no heart or
very imperfect one, mainly due to abnormal anastomosis of umbilical vessel in the
common placenta between normal and malformed twin.
Up today, many cases are reported as the four types, acardius ancephalus, acardius
acephalus, acardius acormus and acardius amorphus. Here, we have a good opportunity
to study one case of fetus acardius at the Department of Pathology, Catholic Medical
College.
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