CHILD syndrome

What it is, symptoms and effects

From: MedlinePlus Genetics, National Library of Medicine

CHILD syndrome is a condition that affects the development of several parts of the body. The name of the condition is an acronym of the major features: congenital hemidysplasia with ichthyosiform erythroderma and limb defects. The signs and symptoms of this disorder may vary from person to person, but they are typically limited to only one side of the body ("hemi-" means "half," and "dysplasia" refers to abnormal growth). The right side of the body is affected more often than the left side.

People with CHILD syndrome often have a skin condition characterized by large patches of skin that are red and inflamed (erythroderma) and covered with yellow, flaky scales (ichthyosis). This condition is most likely to occur in skin folds and creases and usually does not affect the face. The skin abnormalities are typically present at birth or appear within the first few weeks of life and may improve with time.

CHILD syndrome may also disrupt the formation of the arms and legs during early development. Some children with this disorder have shortened bones in the fingers or toes, while others have shortened or missing limbs. The limb abnormalities typically occur on the same side of the body as the skin abnormalities.

Some children have a curvature of the spine (scoliosis) or joint deformities that restrict movement (contractures). In some cases, CHILD syndrome affects the development of the brain, heart, lungs, and kidneys.

Causes and biological mechanisms

From: MedlinePlus Genetics, National Library of Medicine

Variants (also called mutations) in the NSDHL gene cause CHILD syndrome. This gene provides instructions for making an enzyme that is involved in the production of cholesterol. Cholesterol is a type of fat that is produced in the body and obtained from foods that come from animals, particularly egg yolks, meat, and dairy products. Although high cholesterol levels are a well-known risk factor for heart disease, the body needs some cholesterol to develop and function normally both before and after birth. Cholesterol is an important component of cell membranes and the protective substance that covers nerve cells (myelin). Additionally, cholesterol plays a role in the production of certain hormones and digestive acids.

The variants that cause CHILD syndrome change either the amount or the activity of the NSDHL enzyme, which disrupts the normal production of cholesterol within cells. Without enough of this enzyme, potentially toxic byproducts of cholesterol synthesis can build up in the body's tissues. Researchers suspect that low cholesterol levels can contribute to problems with the growth and development of many parts of the body. It is not known, however, exactly how a disturbance in cholesterol production leads to the specific features of CHILD syndrome.

Inheritance and family implications

From: MedlinePlus Genetics, National Library of Medicine

This condition is inherited in an X-linked dominant pattern. The gene associated with this condition is located on the X chromosome, which is one of the two sex chromosomes. In females (who have two copies of the X chromosome), a variant in one of the two copies of the gene in each cell is sufficient to cause the disorder, although the signs and symptoms may be mild.

Researchers believe that affected males (who have only one X chromosome) have more severe signs and symptoms and typically die before birth.

How common is it?

From: MedlinePlus Genetics, National Library of Medicine

CHILD syndrome is a rare disorder; fewer than 100 people with this condition have been reported in the medical literature. This condition occurs almost exclusively in females.

Reported clinical features and what the terms mean

The following findings are associated with this condition in Orphanet. They are not a checklist for diagnosing yourself, and they do not all occur in every affected person. Some are examination, imaging or laboratory findings that cannot be recognised at home.

The frequency labels describe how often a finding was reported among people with the condition in the source. They do not give the chance that a person with that symptom has the condition. Definitions below reproduce HPO terminology; they explain the term, not the likely severity in an individual.

Epiphyseal stippling · Very frequent (99-80%)

The presence of abnormal punctate (speckled, dot-like) calcifications in one or more epiphyses.

Abnormality of the periungual region · Frequent (79-30%)

An abnormality of the region around the nails of the fingers or toes.

Congenital ichthyosiform erythroderma · Frequent (79-30%)

An ichthyosiform abnormality of the skin with congenital onset.

Epidermal acanthosis · Frequent (79-30%)

Diffuse hypertrophy or thickening of the stratum spinosum of the epidermis (prickle cell layer of the skin).

Hyperkeratosis · Frequent (79-30%)

Hyperkeratosis is a histopathological term defining a thickened stratum corneum and may be present in many different skin conditions, with many possible overlaps. Hyperkeratosis refers to the increased thickness of the stratum corneum, the outer layer of the skin. Hyperkeratosis is subclassified as orthokeratotic or parakeratotic. Orthokeratotic hyperkeratosis refers to the thickening of the keratin layer with preserved keratinocyte maturation, while parakeratotic hyperkeratosis shows retained nuclei as a sign of delayed maturation of keratinocytes.

Parakeratosis · Frequent (79-30%)

Abnormal formation of the keratinocytes of the epidermis characterized by persistence of nuclei, incomplete formation of keratin, and moistness and swelling of the keratinocytes.

Short metacarpal · Frequent (79-30%)

Diminished length of one or more metacarpal bones in relation to the others of the same hand or to the contralateral metacarpal.

Verruciform xanthoma · Frequent (79-30%)

A papillary or cauliflower-like growth characterized by the presence of foamy histiocytes within the elongated dermal papillae forms.

Other findings in the same source

From: Orphanet

Additional reported features include Aplasia/hypoplasia involving bones of the extremities (Frequent (79-30%)); Congenital onychodystrophy (Frequent (79-30%)); Abnormal heart morphology (Occasional (29-5%)); Amelia (Occasional (29-5%)); Foam cells (Occasional (29-5%)); Morphological central nervous system abnormality (Occasional (29-5%)); Oligodactyly (Occasional (29-5%)); Scoliosis (Occasional (29-5%)); Multiple joint contractures (Occasional (29-5%)); Pulmonary hypoplasia (Occasional (29-5%)). This is a selected summary, not a complete description of the condition.

Which doctor should you see?

The suggested department for discussing CHILD syndrome is Clinical Genetics, with a clinical geneticist as the relevant type of clinician. Paediatrician (children) or physician (adults), with clinical geneticist referral.

This is an editorial referral starting point. The appropriate clinic depends on the person’s age, symptoms, previous diagnosis and local services. The first clinician can decide whether another specialty or a team is needed; a department label does not confirm the diagnosis.

How to prepare for an assessment

Bring a short timeline of the main symptoms: when they first appeared, whether they are constant or episodic, what seems to change them, and how they affect daily activities. Include previous reports, discharge summaries, current medicines and supplements, allergies, and any relevant family history. A dated record is more useful than trying to match every feature in an online article.

Ask the clinician what is already established and what remains uncertain. If a test is suggested, ask what question it answers, what its limitations are and how the result would change the next step. The information here is not an instruction to arrange every possible test. In children, bring growth, developmental and school information if it is relevant to the concern.

• Does the exact genetic or chromosome finding explain the observed features?
• Would a genetic counsellor help the family understand the result?
• Which organ-specific assessments are appropriate for this particular diagnosis?

Treatment discussions and follow-up

The material gathered for this draft does not provide a complete condition-specific treatment pathway for CHILD syndrome. That gap does not mean that treatment is unavailable. A clinician needs to establish the diagnosis and review current guidance before recommending medicines, procedures, rehabilitation or other support.

Before leaving the appointment, clarify the next review date, who will communicate results, and whom to contact if the situation changes. Discuss difficulties with sleep, work, school, mobility, eating or emotional wellbeing when these are relevant. Practical support may require coordination between the treating clinician and other services.

The collected references do not establish a complete prevention or long-term outlook section for this entry. Missing information should not be interpreted as proof that prevention is impossible or that a particular outcome is inevitable. Ask what is known for the exact subtype, stage and personal circumstances, and which uncertainties remain.

When to seek emergency help

Severe breathing difficulty, collapse, new stroke-like symptoms, a seizure that is prolonged or repeated without recovery, uncontrolled major bleeding, or an immediate risk of self-harm require emergency help. In India, call 112 or reach the nearest emergency department. This is a general, non-exhaustive warning list; it is not a condition-specific triage tool.