Cardiovascular system of the conjoined twins.

The cardiovascular system of the dicephalus (2 spines, one pelvis) conjoined twins is being described. The heart consists of 2 atria and 3 ventricles. Various malformations are evident in the layout systematic and pulmonary circulation. The vascular system can be divided into 3 zones: an upper one--with an almost symmetrical duplication, a middle one--with an atypical pattern, and a lower one--with a normal pattern.