deranencephaly

der·an·en·ceph·a·ly

, deranencephalia (der-an'en-sef'ă-lē, -se-fā'lē-ă),
1. Congenital malformation in which the head is absent, although there is a rudimentary neck.
2. Defect of the brain and upper part of the spinal cord.
[G. derē, neck, + an-, priv., + kephalē, head]