This article provides some additions and corrections on a recently published 
case report concerning a pair of di-symmetrical cephalopagus conjoined twins. 
Eight different types of conjoined twins can be distinguished; one is 
cephalopagus, which is fourth in rarity of occurrence. Between 17 and 24% of 
cephalopagus is of the male sex. More than 30 case reports of di-symmetrical 
cephalopagus can be traced in Western literature, the oldest one described and 
illustrated in 1569.