Heteropagus twins: report of two cases

Heteropagus twins are an extremely rare form of asymmetrical conjoined monochorial monoamniotic twins with an estimated incidence of less than one per one million live births (1). An often-used synonym is «parasitic twins». The term heteropagus describes twins in which one of them has a mostly intact body that is able to survive and which is referred to as «autosite», while the ounterpart, referred to as «parasite», is only rudimentarily developed being physically attached to and nourished by the other twin.