NINDS Holoprosencephaly Information Page

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What is Holoprosencephaly?
Is there any treatment?
What is the prognosis?
What research is being done?

Organizations

What is Holoprosencephaly?
Holoprosencephaly is a disorder caused by the failure of the prosencephalon (the embryonic forebrain) to sufficiently divide into the double lobes of the cerebral hemispheres. The result is a single-lobed brain structure and severe skull and facial defects. In most cases of holoprosencephaly, the malformations are so severe that babies die before birth. In less severe cases, babies are born with normal or near-normal brain development and facial deformities that may affect the eyes, nose, and upper lip.

There are three classifications of holoprosencephaly. Alobar, in which the brain has not divided at all, is usually associated with severe facial deformities. Semilobar, in which the brain's hemispheres have somewhat divided, causes an intermediate form of the disorder. Lobar, in which there is considerable evidence of separate brain hemispheres, is the least severe form. In some cases of lobar holoprosencephaly the baby's brain may be nearly normal.

The least severe of the facial anomalies is the median cleft lip (premaxillary agenesis). The most severe is cyclopia, an abnormality characterized by a single eye located in the area normally occupied by the root of the nose, and a missing nose or a proboscis (a tubular-shaped nose) located above the eye. The least common facial anomaly is ethmocephaly, in which a proboscis separates closely-set eyes. Cebocephaly, another facial anomaly, is characterized by a small, flattened nose with a single nostril situated below incomplete or underdeveloped closely-set eyes.

Is there any treatment?

There is no standard course of treatment for holoprosencephaly. Treatment is symptomatic and supportive.

What is the prognosis?

The prognosis for individuals with the disorder depends on the severity of the brain and facial deformities.

What research is being done?

The NINDS supports and conducts a wide range of studies that focus on identifying and learning more about the factors involved in normal brain development. Recent research has identified specific genes that cause holoprosencephaly. The knowledge gained from these fundamental studies provides the foundation for understanding how to develop new ways to treat, and potentially prevent, this disorder.

Select this link to view a list of studies currently seeking patients.

Organizations

Carter Centers for Research in Holoprosencephaly
c/o Texas Scottish Rite Hospital P.O. Box 190567
2222 Welborn Street
Dallas, TX   75219-9982
hpe@tsrh.org
http://www.stanford.edu/group/hpe
Tel: 214-559-8411
Fax: 214-559-8383

National Organization for Rare Disorders (NORD)
P.O. Box 1968
(55 Kenosia Avenue)
Danbury, CT   06813-1968
orphan@rarediseases.org
http://www.rarediseases.org
Tel: 203-744-0100 Voice Mail 800-999-NORD (6673)
Fax: 203-798-2291

The Arc of the United States
1010 Wayne Avenue
Suite 650
Silver Spring, MD   20910
Info@thearc.org
http://www.thearc.org
Tel: 301-565-3842
Fax: 301-565-3843 or -5342

March of Dimes Foundation
1275 Mamaroneck Avenue
White Plains, NY   10605
askus@marchofdimes.com
http://www.marchofdimes.com
Tel: 914-428-7100 888-MODIMES (663-4637)
Fax: 914-428-8203



Prepared by:
Office of Communications and Public Liaison
National Institute of Neurological Disorders and Stroke
National Institutes of Health
Bethesda, MD 20892



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Last updated February 13, 2007