Multiple endocrine neoplasia type 2

What it is

From: Orphanet

A rare multiple endocrine neoplasia (MEN) syndrome that is principally characterized by the association of medullary thyroid carcinoma (MTC) with other endocrine tumors. The variant MEN 2A is defined by MTC associated with pheochromocytoma and/or primary hyperparathyroidism (MEN2A); the variant MEN 2B is defined as an aggressive form of MTC in association with pheochromocytoma but without primary hyperparathyroidism.

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.

Medullary thyroid carcinoma · Very frequent (99-80%)

The presence of a medullary carcinoma of the thyroid gland.

Anxiety · Frequent (79-30%)

Intense feelings of nervousness, tension, or panic often arise in response to interpersonal stresses. There is worry about the negative effects of past unpleasant experiences and future negative possibilities. Individuals may feel fearful, apprehensive, or threatened by uncertainty, and they may also have fears of falling apart or losing control.

Cervical neoplasm · Frequent (79-30%)

A tumor (abnormal growth of tissue) of the uterine cervix.

Diarrhea · Frequent (79-30%)

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

Elevated calcitonin · Frequent (79-30%)

Concentration of calcitonin, a 32-amino acid polypeptide hormone that is produced primarily by the parafollicular cells of the thyroid, in the blood circulation above the upper limit of normal.

Elevated urinary catecholamines · Frequent (79-30%)

The concentration of a catecholamine in the urine, normalized for urine concentration, is above the upper limit of normal.

Elevated urinary epinephrine · Frequent (79-30%)

The concentration of epinephrine in the urine, normalized for urine concentration, is above the upper limit of normal.

Elevated urinary norepinephrine · Frequent (79-30%)

The concentration of noradrenaline in the urine, normalized for urine concentration, is above the upper limit of normal.

Elevated urinary vanillylmandelic acid · Frequent (79-30%)

An increased concentration of vanillylmandelic acid in the urine.

Headache · Frequent (79-30%)

Cephalgia, or pain sensed in various parts of the head, not confined to the area of distribution of any nerve.

Hyperhidrosis · Frequent (79-30%)

Abnormal excessive perspiration (sweating) despite the lack of appropriate stimuli like hot and humid weather.

Hypertension associated with pheochromocytoma · Frequent (79-30%)

A type of hypertension associated with pheochromocytoma.

Pallor · Frequent (79-30%)

Abnormally pale skin.

Palpitations · Frequent (79-30%)

A sensation that the heart is pounding or racing, which is a non-specific sign but may be a manifestation of arrhythmia.

Other findings in the same source

From: Orphanet

Additional reported features include Parathyroid hyperplasia (Frequent (79-30%)); Pheochromocytoma (Frequent (79-30%)); Thyroid C cell hyperplasia (Frequent (79-30%)); Thyroid nodule (Frequent (79-30%)); Hypertensive crisis (Frequent (79-30%)); Abdominal distention (Occasional (29-5%)); Abnormal tongue morphology (Occasional (29-5%)); Aganglionic megacolon (Occasional (29-5%)); Cervical lymphadenopathy (Occasional (29-5%)); Constipation (Occasional (29-5%)). This is a selected summary, not a complete description of the condition.

When it may begin

From: Orphanet

Adolescent; Adult; Childhood; Infancy

Inheritance in the source

From: Orphanet

Autosomal dominant

Frequency and the population described

From: Orphanet

Point prevalence: 1-9 / 100 000; Europe; Value and class. Point prevalence: 1-9 / 100 000; Germany; Value and class.

Understanding the inheritance label

From: MedlinePlus Genetics

An autosomal dominant pattern means that one altered copy of a relevant gene can be sufficient for the condition. Some affected people inherit the change; others have a new change without an affected parent. The precise finding, family history and condition determine what this means for relatives.

Which doctor should you see?

The suggested department for discussing Multiple endocrine neoplasia type 2 is Oncology, with a oncologist and relevant organ specialist 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: Relevant organ specialist / Surgical Oncology as indicated.

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.

• Has the exact tumour type been confirmed, and is staging relevant?
• What is the goal of each proposed treatment option?
• How will side effects, daily function and supportive care be addressed?

Treatment discussions and follow-up

The material gathered for this draft does not provide a complete condition-specific treatment pathway for Multiple endocrine neoplasia type 2. 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.