A neural tube defect (NTD) that occurs when the cephalic (head) end of the neural tube fails to close, usually between the 23rd and 26th days of pregnancy, resulting in the absence of a major portion of the brain, skull, and scalp. Infants with this disorder are born without a forebrain, the largest part of the brain consisting mainly of the cerebr [..]

Congenital defect that occurs during fetal brain development when the neural tube fails to close properly at the head. The result is the lack of development of a large portion of the brain and skull.

markedly defective development of the brain, cerebral hemispheres absent or reduced to small masses, together with absence of the bones of the cranium.

Absence of the greater part of the brain, often with skull deformity.

n. a congenital abnormality resulting in the absence of the bones forming the base of the skull (cranial vault), and missing or vastly reduced cerebral hemispheres. Individuals born with these deficit [..]

A birth defect characterized by under-development of the brain and skull.

(French : anencéphalie) Absence of cranial bone structure usually accompanied by a severe brain defect.

Absence of the greater part of the brain, often with skull deformity.

(n) a defect in brain development resulting in small or missing brain hemispheres

A birth defect in which an infant is born without most of the brain or without the skull bones covering the brain.

Congenital deformity of the brain (Modern)

Anencephaly is a neural tube defect which results in an infant being born with a malformed skull and all or part of the brain missing.

a birth defect, known as a neural tube defect, resulting from failure of the upper end of the neural tube to close during embryonic development. Anencephaly is a devastating and sometimes fatal birth [..]

A malformation of the Nervous System caused by failure of the anterior neuropore to close. Infants are born with intact spinal cords, Cerebellums, and Brainstems, but lack formation of neural structur [..]

A malformation of the nervous system caused by failure of the anterior neuropore to close. Infants are born with intact spinal cords, cerebellums, and brainstems, but lack formation of neural structur [..]

a condition that is present at birth and affects the formation of the brain and the skull bones that surround the head, resulting in only minimal development of the brain. There is no bony covering ov [..]

A congenital absence of the brain and cranial vault, with the cerebral hemispheres completely missing or greatly reduced in size. (27 Sep 1997)

condition of forebrain degeneration caused by failure of anterior neuropore closure and consequent prolonged contact of the forebrain with amniotic fluid. Although infants with this neural tube defect [..]