Thoracopagus-Joined at the upper chest
Omphalopagus-Joined at the abdomen
Ischiopagus-Joined at the front pelvis and sacrum(lower spine)
Parapagus-Joined side by side at the torso
Dicephalus-A subset of parapagus
Craniopagus-Joined by the portion of the skull
Pypopagus-Joined back to back at the pelvis and lower spine
Parasistic-Any of the above types can result in a case of parasitic twins if one twin dies or receives inadequate nutrition while in utero
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