TABLE 1.

Types of conjoined twinning presented in this article and their characteristics

Ventral conjunction	Omphalopagus	Joined at the sternal ends, diaphragms, livers and umbilicus; two separate hearts (Figure 1b)
	Thoracoileopagus	Joined at the thoraxes and umbilicus; two compound sternums, diaphragms and livers; one shared multichambered heart (Figure 1c)
	Prosopothoracoileopagus	Joined at the lower faces, necks, thoraxes and umbilicus; usually two compound hearts, sternums, diaphragms, and livers (Figure 1d)
	Cephalothoracoileopagus	Joined at the heads, necks, thoraxes and umbilicus; two compound hearts, faces, sternums, diaphragms, and livers (Figure 1e)
Lateral conjunction	Parapagus dicephalus tribrachius	Shared lower body and abdomen; partially duplicated thorax; two heads and a shared third arm; usually one shared multichambered heart or two separate hearts (Figure 1f)
	Parapagus dicephalus dibrachius	Shared lower and upper body; two heads; usually one shared multichambered or four‐chambered heart (Figure 1g)
	Parapagus diprosopus	Shared body and head; (partially) duplicated face; usually one shared four‐chambered heart (Figure 1h)