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Disease Profile

White matter hypoplasia-corpus callosum agenesis-intellectual disability syndrome

Prevalence estimates on Rare Medical Network websites are calculated based on data available from numerous sources, including US and European government statistics, the NIH, Orphanet, and published epidemiologic studies. Rare disease population data is recognized to be highly variable, and based on a wide variety of source data and methodologies, so the prevalence data on this site should be assumed to be estimated and cannot be considered to be absolutely correct.

<1 / 1 000 000

US Estimated

Europe Estimated

Age of onset





Autosomal dominant A pathogenic variant in only one gene copy in each cell is sufficient to cause an autosomal dominant disease.


Autosomal recessive Pathogenic variants in both copies of each gene of the chromosome are needed to cause an autosomal recessive disease and observe the mutant phenotype.


dominant X-linked dominant inheritance, sometimes referred to as X-linked dominance, is a mode of genetic inheritance by which a dominant gene is carried on the X chromosome.


recessive Pathogenic variants in both copies of a gene on the X chromosome cause an X-linked recessive disorder.


Mitochondrial or multigenic Mitochondrial genetic disorders can be caused by changes (mutations) in either the mitochondrial DNA or nuclear DNA that lead to dysfunction of the mitochondria and inadequate production of energy.


Multigenic or multifactor Inheritance involving many factors, of which at least one is genetic but none is of overwhelming importance, as in the causation of a disease by multiple genetic and environmental factors.


Not applicable


Other names (AKA)

Curatolo Cilio Pessagno syndrome; Familial white matter hypoplasia, agenesis of the corpus callosum, intellectual disability and growth deficiency; Curatolo-Cilio-Pessagno syndrome


Congenital and Genetic Diseases; Nervous System Diseases


White matter hypoplasiacorpus callosum agenesisintellectual disability syndrome is a very rare neurological condition. The few patients described in the medical literature were characterized by brain anomalies; an unusual face with broad nasal root, widely spaced eyes (hypertelorism), and a very small chin (micrognathia); failure to thrive; severe intellectual disability; and lack of muscle tone (hypotonia). Exams of the brain showed poor development (hypoplasia) of the pale part of the brain known as white matter, and an absent or abnormal corpus callosum (nerve fibers joining the two hemispheres of the brain). Only a few cases have been described. The cause is unknown but may be related to a disorder of axonal development. The described cases seem to be inherited in an autosomal recessive or X-linked way. Corpus callosum agenesis is one of the more frequent congenital malformations. It can be either asymptomatic or associated with intellectual disability, epilepsy, or psychiatric syndromes. It can be part of several genetic syndromes, such as Aicardi syndrome, Andermann syndrome and Apert syndrome, trisomies 13, 18; or result from metabolic causes; drugs (cocaine); or viral infection (influenza). Many patients with corpus callosum anomalies have other brain anomalies, including white matter hypoplasia. There is no information on specific treatment for this condition.[1][2]


This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.

Medical Terms Other Names
Learn More:
80%-99% of people have these symptoms
Aplasia/Hypoplasia of the corpus callosum
Cerebral cortical atrophy
Decrease in size of the outer layer of the brain due to loss of brain cells
Cerebral white matter hypoplasia
Frontal bossing
Increased reflexes
Wide-set eyes
Widely spaced eyes

[ more ]

Intellectual disability
Mental deficiency
Mental retardation
Mental retardation, nonspecific

[ more ]

Abnormally small skull
Decreased circumference of cranium
Decreased size of skull
Reduced head circumference
Small head circumference

[ more ]

Little lower jaw
Small jaw
Small lower jaw

[ more ]

Muscular hypotonia
Low or weak muscle tone
Short stature
Decreased body height
Small stature

[ more ]

Wide nasal bridge
Broad nasal bridge
Broad nasal root
Broadened nasal bridge
Increased breadth of bridge of nose
Increased breadth of nasal bridge
Increased width of bridge of nose
Increased width of nasal bridge
Nasal bridge broad
Wide bridge of nose
Widened nasal bridge

[ more ]

30%-79% of people have these symptoms
Aplasia/Hypoplasia of the cerebellum
Absent/small cerebellum
Absent/underdeveloped cerebellum

[ more ]

Downslanted palpebral fissures
Downward slanting of the opening between the eyelids

[ more ]

5%-29% of people have these symptoms
Adducted thumb
Inward turned thumb


Support and advocacy groups can help you connect with other patients and families, and they can provide valuable services. Many develop patient-centered information and are the driving force behind research for better treatments and possible cures. They can direct you to research, resources, and services. Many organizations also have experts who serve as medical advisors or provide lists of doctors/clinics. Visit the group’s website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.

Organizations Supporting this Disease

    Learn more

    These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.

    Where to Start

      In-Depth Information

      • The Monarch Initiative brings together data about this condition from humans and other species to help physicians and biomedical researchers. Monarch’s tools are designed to make it easier to compare the signs and symptoms (phenotypes) of different diseases and discover common features. This initiative is a collaboration between several academic institutions across the world and is funded by the National Institutes of Health. Visit the website to explore the biology of this condition.
      • Orphanet is a European reference portal for information on rare diseases and orphan drugs. Access to this database is free of charge.
      • PubMed is a searchable database of medical literature and lists journal articles that discuss White matter hypoplasia-corpus callosum agenesis-intellectual disability syndrome. Click on the link to view a sample search on this topic.


        1. Curatolo P, Cilio MR, Del Giudice E, Romano A, Gaggero R & Pessagno A. . Familial white matter hypoplasia, agenesis of the corpus callosum, mental retardation and growth deficiency: a new distinctive syndrome. Neuropediatrics. April, 1993; 24(2):77-82. https://www.ncbi.nlm.nih.gov/pubmed/8327066.
        2. Jonas RE, Kimonis VE & Morales A. Possible new autosomal recessive syndrome of partial agenesis of the corpus callosum, pontine hypoplasia, focal white matter changes, hypotonia, mental retardation, and minor anomalies. Am J Med Genet. December 12, 1997; 73(2):184-8. https://www.ncbi.nlm.nih.gov/pubmed/9409870.