• Thoracopagus: Ventral or frontal union at the chest, often with a shared heart; most common form of conjoined twins; about 35% of all conjoined twins.
• Omphalopagus: Ventral or frontal union at the abdomen, often with shared liver tissue; the highest survival rate; about 30% of all conjoined twins.
• Pyopagus: Dorsal or rear union at pelvis; about 19% of all conjoined twins; never involves the heart or umbilicus.
• Ischiopagus: Ventral or frontal union at the pelvis, often with shared intestines, bladders, genitals and kidneys; about 6% of all conjoined twins.
• Parapagus: Lateral or side union with a variety of third and fourth limbs; conjoinment extends a variable distance upward; about 5% of all conjoined twins.
• Craniopagus: Dorsal or rear union at the head; only about 2% of all conjoined twins; never involves the heart or umbilicus.
• Rachipagus: Dorsal or rear union at the spine.
• Cephalopagus: Ventral or frontal union including the head and chest; two faces on the opposite sides of the head; do not survive; extremely rare.
• Dicephalus: This refers to one body and two heads.

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