Thoracopagus twins share a heart, which, depending on how closely they are joined, makes it nearly impossible to separate them and save them both. Thoracopagus twins make up about 40 percent of all conjoined cases
Source: Conjoined Twins Facts | University of Maryland Medical Center http://umm.edu/programs/conjoined-twins/facts-about-the-twins#ixzz3IrRqypeQ
University of Maryland Medical Center
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