http://www-medlib.med.utah.edu/WebPath/PEDHTML/PEDIDX.html
Abnormalities of Twinning:
Siamese twins (craniothoracopagus), gross
Siamese twins (thoracopagus ), gross
Acardius acephalus (chorangiopagus parasiticus), gross
Acardius anceps (chorangiopagus parasiticus), gross
Twin-twin transfusion syndrome, gross
Neural Tube Defects:
Meningomyelocele, gross
Meningomyelocele, gross
Anencephaly, gross
Anencephaly, gross
Anencephaly, gross
Iniencephaly, gross
Rachischisis, gross
Iniencephaly, encephalocele, rachischisis, gross
Exencephaly, gross