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Adenohypophysis Pathology

Pathologia adenohypophysis

For medical students2 min readUpdated 2026-10-10

Disruption of the normal function of the hypophyseal complex predictably leads to a range of pathologies that can pose a direct threat to the patient's life. The study of these conditions is built upon a fundamental understanding of the anterior pituitary gland's functional activity.

Main criterionClassification is based on gland hormone excess or deficiency

Important featurePure partial forms of hypopituitarism are extremely rare

Leading syndromeDetermines the clinical picture in combined deficiencies

Characteristics and Basic Division

In clinical pathophysiology, all nosological forms of adenohypophysis pathology are classified according to several strict criteria. Regardless of the patient's age (pathologies occur in both children and adults), all diseases of this localization are broadly divided into two major groups depending on the functional state of the gland:

Hyperpituitary forms — conditions characterized by excessive anterior pituitary function and overproduction of its respective hormones.
Hypopituitary forms — pathologies based on adenohypophyseal insufficiency.

Hypopituitarism: Definition and Types

Hypopituitarism is defined as a prototype pathology of the adenohypophysis characterized by inadequate content and/or reduced physiological effects of one or several of its hormones simultaneously.

Depending on the extent of functional loss, the main types of adenohypophyseal insufficiency are divided into two key groups:

Partial disorders.
Total disorders (panhypopituitarism).

Partial Forms

This group of pathologies is characterized by the loss of function of individual adenohypophyseal hormones. The main nosologies of partial hypopituitarism include:

Pituitary hypogonadism (decreased function related to the regulation of the gonads).
Pituitary obesity.
Pituitary dwarfism, also known in medical terminology as nanism.
Adiposogenital dystrophy.
Pituitary hypocortisolism, classified as secondary adrenal insufficiency.
Pituitary hypothyroidism (secondary hypothyroidism).

Total Forms (Panhypopituitarism)

Unlike partial disorders, total forms are characterized by the complete (total) loss of all adenohypophyseal functions. This severe group of pathologies includes:

Pituitary cachexia (frequently designated in clinical practice as Simmonds disease).
Postpartum hypopituitarism (Sheehan syndrome).
General hypothalamic-pituitary insufficiency.

Features of the Clinical Picture

A crucial rule of endocrinology and pathophysiology states: "pure" partial isolated forms of adenohypophyseal insufficiency are practically nonexistent in clinical practice.

As a rule, patients develop a combined deficiency of multiple hormones simultaneously. Nevertheless, the symptoms are always dominated by signs of deficiency in a single tropic function. This leading syndrome determines the entire clinical picture of the disease encountered by the physician.

Mnemonic

To memorize the total forms of hypopituitarism, use the abbreviation S-S-H: Simmonds (cachexia), Sheehan (postpartum), Hypothalamic-pituitary insufficiency.

Frequently asked questions

What are the main causes of Sheehan syndrome?

The primary causes of Sheehan syndrome are massive postpartum or post-abortion hemorrhages. The hemorrhage leads to acute infarction or necrosis of the pituitary gland, alongside intravascular thrombosis. Ischemia is further promoted by the physiological postpartum reduction in ACTH secretion.

Which specific hormones are produced by the adenohypophysis?

The adenohypophysis produces the following hormones:

Follicle-stimulating hormone (FSH).
Luteinizing hormone (LH).
Adrenocorticotropic hormone (ACTH, corticotropin).
Growth hormone (GH, somatotropin).
Thyroid-stimulating hormone (TSH, thyrotropin).
Prolactin (lactogenic, lactotropic hormone).
Melanocyte-stimulating hormone.

What is the difference between Cushing's disease and Cushing's syndrome?

The difference between Cushing's disease and Cushing's syndrome lies in the localization of the primary lesion and the ACTH level.

Feature	Cushing's Disease	Cushing's Syndrome
Genesis	Central (pituitary adenoma)	Peripheral (adrenal tumor or hyperplasia, ectopic ACTH production)
ACTH Level	High	Low (via negative feedback)
Pathogenesis	Pituitary adenoma hypersecretes ACTH, secondarily hyperstimulating the adrenal cortex	Autonomous hypersecretion of hormones by the primary adrenal lesion itself

What determines the clinical picture in combined adenohypophyseal lesions?

In combined deficiencies, the picture is determined by the leading syndrome — the dominant signs of deficiency in a single tropic function.

Do completely pure partial forms exist?

No, pure isolated partial forms of adenohypophyseal insufficiency are virtually never seen. Combined deficiencies are most common.

What are alternative terms for pituitary hypothyroidism and hypocortisolism?

Pituitary hypothyroidism is called secondary hypothyroidism, and pituitary hypocortisolism is called secondary adrenal insufficiency.

Go deeper

Mechanisms and causes of hyperpituitary states
Pathogenesis of Simmonds disease (pituitary cachexia)
Etiology of Sheehan syndrome in the postpartum period
Clinical manifestations of adiposogenital dystrophy
Diagnostic features of secondary adrenal insufficiency