Abstract
A human thoracopagus of slightly unequal
twins having a common umbilical cord with
exomphalos is described, with special reference to
the cardiovascular system. The larger twin had
single umbilical artery. The smaller twin had a
large left umbilical artery which was in direct
continuity with the aorta, a small right umbilical
artery with sole connection to the right external
and internal iliac arteries (right common iliac
artery was absent), missing umbilical vein, a
rudimentary nonfunctional heart with atresia of
the truncus arteriosus, and a right-sided aortic
arch. Exomphalos of both twins is accounted by the
possible defective growth of umbilical mesoderm
caused by abnormal umbilical vessels. Reversal of
systemic circulation in the upper part of the body
of smaller twin is discussed. The importance of a
careful study of umbilical veins is
emphasized.
Publisher
Cambridge University Press (CUP)
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