Short-limb skeletal dysplasia with severe combined immunodeficiency

What it is

From: Orphanet

An extremely rare type of severe combined immunodeficiency (SCID) characterized by the classical signs of T-B- SCID (severe and recurrent infections, diarrhea, failure to thrive, absence of T and B lymphocytes), associated with skeletal anomalies like short stature, bowing of the long bones and metaphyseal abnormalities of variable degree of severity.

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.

Abnormal metaphysis morphology · Very frequent (99-80%)

An abnormality of one or more metaphysis, i.e., of the somewhat wider portion of a long bone that is adjacent to the epiphyseal growth plate and grows during childhood.

Cellular immunodeficiency · Very frequent (99-80%)

An immunodeficiency characterized by defective cell-mediated immunity or humoral immunity.

Lymphopenia · Very frequent (99-80%)

A reduced number of lymphocytes in the blood.

Recurrent respiratory infections · Very frequent (99-80%)

An increased susceptibility to respiratory infections as manifested by a history of recurrent respiratory infections.

Severe combined immunodeficiency · Very frequent (99-80%)

A type of primary immune deficiency that is characterized by a more severe defect in both the T- and B-lymphocyte systems.

Agammaglobulinemia · Frequent (79-30%)

A lasting absence of total IgG and total IgA and total IgM in the blood circulation, whereby at most trace quantities can be measured.

Biparietal narrowing · Frequent (79-30%)

A narrowing of the biparietal diameter (i.e., of the transverse distance between the protuberances of the two parietal bones of the skull).

Fine hair · Frequent (79-30%)

Hair that is fine or thin to the touch.

Reduced bone mineral density · Frequent (79-30%)

A reduction of bone mineral density, that is, of the amount of matter per cubic centimeter of bones.

Abnormality of the pancreas · Occasional (29-5%)

An abnormality of the pancreas.

Aganglionic megacolon · Occasional (29-5%)

An abnormality resulting from a lack of intestinal ganglion cells (i.e., an aganglionic section of bowel) that results in bowel obstruction with enlargement of the colon.

Anemia · Occasional (29-5%)

A reduction in erythrocytes volume or hemoglobin concentration.

Cognitive impairment · Occasional (29-5%)

Abnormal cognition is characterized by deficits in thinking, reasoning, or remembering.

Inguinal hernia · Occasional (29-5%)

Protrusion of the contents of the abdominal cavity through the inguinal canal.

Other findings in the same source

From: Orphanet

Additional reported features include Long fibula (Occasional (29-5%)); Malabsorption (Occasional (29-5%)); Pectus excavatum (Occasional (29-5%)); White hair (Occasional (29-5%)). This is a selected summary, not a complete description of the condition.

When it may begin

From: Orphanet

Infancy; Neonatal

Inheritance in the source

From: Orphanet

Not applicable

Frequency and the population described

From: Orphanet

Reported case(s): 19.0; Worldwide. This is a published case count, not prevalence. Point prevalence: <1 / 1 000 000; Worldwide; Class only.

Which doctor should you see?

The suggested department for discussing Short-limb skeletal dysplasia with severe combined immunodeficiency is Allergy and Immunology, with a allergist / clinical immunologist as the relevant type of clinician. General physician / Family Medicine; paediatrician for children. Referral depends on symptoms.

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 history suggest an allergy, an immune problem or another explanation?
• How would any proposed allergy or immune test change care?
• Is an individual emergency plan needed, and who should understand it?

Treatment discussions and follow-up

The material gathered for this draft does not provide a complete condition-specific treatment pathway for Short-limb skeletal dysplasia with severe combined immunodeficiency. 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.