Aldosterone-producing adenoma

What it is, symptoms and effects

From: MedlinePlus Genetics, National Library of Medicine

An aldosterone-producing adenoma is a noncancerous (benign) tumor that develops in an adrenal gland, which is a small hormone-producing gland located on top of each kidney. In most cases, individuals develop a single tumor in one of the adrenal glands. The adrenal tumor produces too much of the hormone aldosterone, which is a condition known as primary hyperaldosteronism. Aldosterone helps regulate the body's fluid levels and blood pressure by controlling the amount of salt retained by the kidneys. Excess aldosterone causes the kidneys to retain more salt than normal, which increases the body's fluid levels and blood pressure. People with an aldosterone-producing adenoma may develop severe high blood pressure (hypertension), and they have an increased risk of heart attack, stroke, or an irregular heart beat (atrial fibrillation).

Causes and biological mechanisms

From: MedlinePlus Genetics, National Library of Medicine

Aldosterone-producing adenomas are caused by mutations in one of several genes. The most commonly mutated gene is KCNJ5, accounting for an estimated 40 percent of the tumors, followed by the CACNA1D and ATP1A1 genes, which are mutated in about 9 percent and 6 percent of aldosterone-producing adenomas, respectively. Changes in other genes cause a small percentage of cases. Only about 60 percent of affected individuals have a mutation in one of the identified genes; additional unidentified genes are also thought to be involved in the condition.

The genes known to be involved in aldosterone-producing adenomas have roles in balancing the amounts of positively charged atoms (ions) of sodium (Na+), potassium (K+), and calcium (Ca2+) in cells. Each of the proteins produced from these genes transports certain ions across cell membranes. The flow of these ions creates an electrical charge across the cell membrane, which affects certain biochemical processes. In adrenal gland cells, this flow of ions helps control the production of aldosterone. Mutations in the KCNJ5, CACNA1D, or ATP1A1 gene lead to abnormal electrical charges across cell membranes. These abnormalities overactivate a biochemical process that increases adrenal cell growth and division (proliferation), which promotes adenoma formation. Overactivation of this biochemical process also increases aldosterone production, resulting in hyperaldosteronism and leading to hypertension.

Inheritance and family implications

From: MedlinePlus Genetics, National Library of Medicine

Aldosterone-producing adenomas are generally not inherited but arise from a mutation in the body's cells that occurs after conception. In particular, the alteration occurs in adrenal gland cells that give rise to the tumor. Such mutations are called somatic mutations.

How common is it?

From: MedlinePlus Genetics, National Library of Medicine

Aldosterone-producing adenomas cause up to 60 percent of cases of primary hyperaldosteronism. It is estimated that primary hyperaldosteronism accounts for 5 to 15 percent of cases of hypertension, which affects approximately 3 in 10 adults worldwide. However, the prevalence of aldosterone-producing adenomas is unknown.

Understanding terms used in the source

These definitions explain medical words used above. A definition is not evidence that another condition is present, and it does not predict how a symptom will develop. Ask the clinician which terms apply to the actual examination or test result.

Primary hyperaldosteronism

A form of hyperaldosteronism caused by a defect within the adrenal gland.

Atrial fibrillation

An atrial arrhythmia characterized by disorganized atrial activity without discrete P waves on the surface EKG, but instead by an undulating baseline or more sharply circumscribed atrial deflections of varying amplitude an frequency ranging from 350 to 600 per minute.

Affected

This term applies to a family member who is diagnosed with the same condition as the individual who is the primary focus of investigation (the proband).

Which doctor should you see?

The suggested department for discussing Aldosterone-producing adenoma 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 Aldosterone-producing adenoma. 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.