TSH-secreting pituitary adenoma

What it is

From: Orphanet

A rare, functioning, pituitary adenoma characterized by the presence of a pituitary mass associated with high levels of circulating, free, thyroid hormones in conjunction with normal to high levels of TSH and unresponsiveness of TSH levels to TRH stimulation and T3 suppression tests, typically manifesting with signs and symptoms of mild to moderate hyperthyroidism (e.g. goiter (most frequently observed), palpitation, excessive sweating, arrhythmia, weight loss, tremor) and/or tumor mass effect (such as headache, visual field defects, hypopituitarism). Occasionally, cosecretion of prolactin and/or growth hormone may cause galactorrhea and/or acromegaly.

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.

Abnormality of the pituitary gland · Very frequent (99-80%)

An anomaly of the pituitary gland.

Elevated circulating thyroid-stimulating hormone concentration · Very frequent (99-80%)

Increased concentration of thyroid-stimulating hormone (TSH) in the blood circulation.

Enlarged pituitary gland · Very frequent (99-80%)

An abnormally increased size of the pituitary gland.

Goiter · Very frequent (99-80%)

An enlargement of the thyroid gland.

Hyperthyroidism · Very frequent (99-80%)

An abnormality of thyroid physiology characterized by excessive secretion of the thyroid hormones thyroxine (i.e., T4) and/or 3,3',5-triiodo-L-thyronine zwitterion (i.e., triiodothyronine or T3).

Abnormal hair quantity · Frequent (79-30%)

An abnormal amount of hair.

Abnormality of the menstrual cycle · Frequent (79-30%)

An abnormality of the ovulation cycle.

Adrenocorticotropic hormone deficiency · Frequent (79-30%)

A reduced ability to secrete adrenocorticotropic hormone (ACTH), a hormone that stimulates the adrenal cortex to secrete of glucocorticoids such as cortisol.

Adrenocorticotropin deficient adrenal insufficiency · Frequent (79-30%)

Adrenal insufficiency secondary to a defect in ACTH production.

Central adrenal insufficiency · Frequent (79-30%)

A form of adrenal insufficiency related to a lack of ACTH, which leads to a decrease in the production of cortisol by the adrenal glands. Aldosterone production is not usually affected.

Decreased circulating ACTH level · Frequent (79-30%)

The concentration of corticotropin, also known as adrenocorticotropic hormone (ACTH), is below the lower limit of normal in the blood circulation.

Decreased female libido · Frequent (79-30%)

Diminished sexual desire in female.

Easy fatigability · Frequent (79-30%)

Increased susceptibility to fatigue.

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.

Other findings in the same source

From: Orphanet

Additional reported features include Fatigue (Frequent (79-30%)); Female hypogonadism (Frequent (79-30%)); Gynecomastia (Frequent (79-30%)); Headache (Frequent (79-30%)); Hyperhidrosis (Frequent (79-30%)); Hypogonadism (Frequent (79-30%)); Hypogonadotropic hypogonadism (Frequent (79-30%)); Hypotension (Frequent (79-30%)); Impotence (Frequent (79-30%)); Irregular menstruation (Frequent (79-30%)). This is a selected summary, not a complete description of the condition.

When it may begin

From: Orphanet

Adolescent; Adult; Childhood; Elderly

Frequency and the population described

From: Orphanet

Point prevalence: 1-9 / 1 000 000; Sweden; Value and class.

Which doctor should you see?

The suggested department for discussing TSH-secreting pituitary adenoma 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

The material gathered for this draft does not provide a complete condition-specific treatment pathway for TSH-secreting pituitary 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.