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Familial isolated pituitary adenoma
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Familial isolated pituitary adenoma

Familial isolated pituitary adenoma (FIPA) is an inherited condition characterized by the development of noncancerous tumors in the pituitary gland.

Overview

Familial isolated pituitary adenoma (FIPA) involves the growth of a noncancerous tumor (pituitary adenoma) in the pituitary gland at the base of the brain. These tumors may release excess hormones or be nonfunctioning.

Common tumor types include:

  • Prolactinomas: These release prolactin. In women, they may cause menstrual changes or unexpected breast milk production. In men, they may cause erectile dysfunction or decreased libido. Large tumors can press on nerves, affecting vision.
  • Somatotropinomas: These release growth hormone. In children, they can cause gigantism (increased height), while in adults, they cause acromegaly (overgrowth of hands, feet, and face).

Other less common types include somatolactotropinomas, nonfunctioning adenomas, adrenocorticotropic hormone-secreting tumors (Cushing disease), thyrotropinomas, and gonadotropinomas. FIPA tumors are often larger and occur at a younger age than sporadic (non-inherited) pituitary adenomas.

Frequency

FIPA is rare, accounting for approximately 2 percent of all pituitary adenomas. More than 200 families with the condition have been described in medical literature.

Causes

FIPA can be caused by mutations in the AIP gene. The AIP protein is thought to act as a tumor suppressor, helping to prevent uncontrolled cell growth. Mutations in this gene impair the protein's function, allowing pituitary cells to divide unchecked. AIP mutations account for 15 to 25 percent of FIPA cases; the genetic causes for the remaining cases are currently unknown.

Inheritance

FIPA is inherited in an autosomal dominant pattern. However, it exhibits incomplete penetrance, meaning only 20 to 30 percent of individuals with an AIP mutation actually develop a pituitary adenoma.

Frequently Asked Questions

Maintain a healthy weight, avoid chronic stress, get adequate sleep, and limit exposure to environmental endocrine disruptors (e.g., certain plastics and pesticides). Regular exercise and a balanced diet rich in antioxidants may also support overall pituitary health, though no definitive prevention strategy exists.
Because only 20–30 % of mutation carriers develop a tumor, genetic counselors emphasize that a positive test does not guarantee disease. Couples may consider pre‑implantation genetic diagnosis, early screening for offspring, and discussing the psychological impact of surveillance versus the low but real risk of tumor development.===
Sudden vision changes, headaches that worsen at night, unexplained menstrual irregularities or infertility in women, erectile dysfunction or loss of libido in men, or sudden onset of excessive sweating or weight gain (suggesting hormone excess) should lead to urgent evaluation with an endocrinologist and MRI.
If a parent carries an AIP mutation, first‑line screening is recommended at age 10–12 for children and at age 20–25 for adults, with repeat MRI scans every 2–3 years thereafter. Early imaging can detect tumors before they grow large enough to cause symptoms.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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