Cephalopagus conjoined twins about 14 weeks gestation!!

Thisisanextremelyraretypeofconjoinedtwins.Theyarefusedfromthevertextotheumbilicus,andshareacommoncraniumwitheitheronecompositefaceortwofaceseachsituatedontheoppositesideofaconjoinedhead.Onexamination,itwasseenthatthetwinswerejoinedfromtheheaddowntothoraxwithonehead,oneface,oneneck,asinglethoraxandabdomen(fusionoftheliver,heart,andtheuppergastrointestinalsystem),andasingleumbilicalcordandspine.Onthefacethereweretwoeyes,onenoseandtwoears.Thepreciseetiologyofconjoinedtwinningisunknown.Themostcommonexplanationisfissionofsinglezygot,oralternativelyfusionoftwodizygoticormonozygoticembryosintheirveryearlyembryonicdevelopmentbetween13and15daysafterconception.Thesetwinstendtobenon-viable.