X-linked adrenal hypoplasia congenita

What it is, symptoms and effects

From: MedlinePlus Genetics, National Library of Medicine

X-linked adrenal hypoplasia congenita is a disorder that is noticeable from birth (congenital) and affects the development of the adrenal glands, which are hormone-producing (endocrine) organs (glands) located on top of each kidney. These glands produce a variety of hormones that regulate many essential functions in the body, such as response to stress.

One of the main signs of this disorder is adrenal insufficiency, which occurs when the adrenal glands do not produce enough hormones. Adrenal insufficiency typically begins in infancy or childhood and can cause vomiting, difficulty with feeding, dehydration, extremely low blood glucose (hypoglycemia), and shock. If untreated, these complications are often life-threatening.

Individuals with X-linked adrenal hypoplasia congenita may also have a shortage of male sex hormones, which leads to underdeveloped reproductive tissues, undescended testicles (cryptorchidism), delayed puberty, and an inability to father children (infertility). Together, these characteristics are known as hypogonadotropic hypogonadism.

The onset and severity of these signs and symptoms can vary, even among affected members of the same family.

ORPHANET DEFINITION A rare genetic adrenal disease characterized by primary adrenal insufficiency (AI) and/or hypogonadotropic hypogonadism (HH). Male patients typically present with AI with acute onset in infancy or insidious onset in childhood. Clinical features of AI include hyperpigmentation, vomiting, poor feeding, failure to thrive, seizures, vascular collapse, and sometimes sudden death. HH manifests later as delayed or arrested puberty. In rare cases, patients become symptomatic in early adulthood with delayed-onset AI, partial HH, and/or infertility. Histologically, the adrenal glands lack the permanent adult cortical zone. The remaining cells are larger than fetal adrenal cells (''cytomegalic'') and contain characteristic nuclear inclusions.

Inheritance

From: MedlinePlus Genetics, National Library of Medicine

X-linked recessive

Frequency in the source

From: MedlinePlus Genetics, National Library of Medicine

Prevalence at birth: 1-9 / 100 000; Worldwide; Value and class. Point prevalence: 1-9 / 100 000; Worldwide; Value and class.

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.

Decreased circulating cortisol level · Very frequent (99-80%)

Abnormally reduced concentration of cortisol in the blood.

Hyperpigmentation of the skin · Very frequent (99-80%)

A darkening of the skin related to an increase in melanin production and deposition.

Increased circulating ACTH level · Obligate (100%)

An abnormal increased in the concentration of corticotropin, also known as adrenocorticotropic hormone (ACTH), in the blood.

Adrenocortical cytomegaly · Frequent (79-30%)

The presence of large polyhedral cells with eosinophilic granular cytoplasm and enlarged nuclei in the adrenal cortex.

Decreased circulating luteinizing hormone level · Frequent (79-30%)

A reduction in the circulating level of luteinizing hormone (LH).

Decreased libido · Frequent (79-30%)

Decreased sexual desire.

Decreased testicular size · Frequent (79-30%)

Reduced volume of the testicle (the male gonad).

Delayed puberty · Frequent (79-30%)

Passing the age when puberty normally occurs with no physical or hormonal signs of the onset of puberty.

Diarrhea · Frequent (79-30%)

Abnormally increased frequency (usually defined as three or more) loose or watery bowel movements a day.

Erectile dysfunction · Frequent (79-30%)

A multidimensional but common male sexual dysfunction that involves an alteration in any of the components of the erectile response, including organic, relational and psychological.

Fatigue · Frequent (79-30%)

A subjective feeling of tiredness characterized by a lack of energy and motivation.

Hyperkalemia · Frequent (79-30%)

The concentration of potassium(1+) in the blood circulation is above the upper limit of normal.

Hypogonadotropic hypogonadism · Frequent (79-30%)

Hypogonadotropic hypogonadism is characterized by reduced function of the gonads (testes in males or ovaries in females) and results from the absence of the gonadal stimulating pituitary hormones: follicle stimulating hormone (FSH) and luteinizing hormone (LH).

Hyponatremia · Frequent (79-30%)

The concentration of sodium in the blood circulation is below the lower limit of normal.

Other findings in the same source

From: Orphanet

Additional reported features include Nausea (Frequent (79-30%)); Oligozoospermia (Frequent (79-30%)); Primary adrenal insufficiency (Frequent (79-30%)); Vertigo (Frequent (79-30%)); Vomiting (Frequent (79-30%)); Decreased serum testosterone concentration (Frequent (79-30%)); Failure to thrive in infancy (Frequent (79-30%)); Seizure (Occasional (29-5%)); Sparse pubic hair (Occasional (29-5%)); Weight loss (Occasional (29-5%)). This is a selected summary, not a complete description of the condition.

When it may begin

From: MedlinePlus Genetics, National Library of Medicine

Childhood; Infancy

Inheritance in the source

From: MedlinePlus Genetics, National Library of Medicine

X-linked recessive

Frequency and the population described

From: MedlinePlus Genetics, National Library of Medicine

Prevalence at birth: 1-9 / 100 000; Worldwide; Value and class. Point prevalence: 1-9 / 100 000; Worldwide; Value and class.

Understanding the inheritance label

From: MedlinePlus Genetics

An X-linked recessive pattern involves a gene on the X chromosome. The number of X chromosomes and the particular genetic change influence how a condition is expressed. A genetic counsellor should interpret the result and the family history before discussing risks for relatives or future pregnancies.

Which doctor should you see?

The suggested department for discussing X-linked adrenal hypoplasia congenita is Endocrinology, with a endocrinologist as the relevant type of clinician. General physician / Family Medicine; paediatrician for children. Referral depends on symptoms.

Additional services that may be relevant, depending on the findings, include: Clinical Genetics.

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.

• Which hormone or metabolic finding is important in this case?
• How should test timing and current medicines be taken into account?
• What follow-up would show whether the care plan is working?

Treatment discussions and follow-up

Where the source describes treatments, these are an overview of possible care, not a prescription for an individual. Ask which option applies to the confirmed diagnosis, what benefit is expected, what adverse effects to watch for and how progress will be assessed. Availability, approvals and local practice can differ from the country described in the source.

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.