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Related Concept Videos

Cushing Syndrome I: Introduction01:26

Cushing Syndrome I: Introduction

Cushing syndrome refers to the collection of clinical manifestations that arise when tissues are exposed to excessive amounts of cortisol or cortisol-like medications over an extended period. Cortisol, a glucocorticoid produced by the adrenal cortex, regulates metabolism, immune responses, and the body’s adaptation to stress. When its concentration remains chronically elevated, these physiological pathways become dysregulated, resulting in the characteristic features of the syndrome.Exogenous...
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Cushing Syndrome II: Pathophysiology

Cortisol production is normally governed by the hypothalamic–pituitary–adrenal (HPA) axis, which maintains hormonal balance through tightly regulated feedback mechanisms. Disruption of this regulatory system is central to the development of Cushing syndrome, whether the excess cortisol originates from external medications or internal pathology. Persistent cortisol elevation alters metabolism, immune function, and endocrine signaling, producing the characteristic clinical features of the...
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Adrenal Gland Disorders

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Hypothalamic-Pituitary Axis

The response to stress—be it physical or psychological, acute or chronic—involves activation of the Hypothalamic-Pituitary-Adrenal (HPA) axis. The HPA axis is part of the neuroendocrine system because it involves both neuronal and hormonal communication. Its function is to regulate homeostatic systems—metabolic, cardiovascular, and immune—providing the necessary means to respond to a stressor.
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Myasthenia gravis is an autoimmune condition affecting neuromuscular transmission, causing generalized weakness in skeletal muscles. Initial diagnoses rely on patients' signs, symptoms, and medical history. The challenge lies in distinguishing myasthenia from other muscular dystrophies. An important diagnostic feature is the significant improvement of symptoms after administering anticholinesterase inhibitors.
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Related Experiment Video

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Fecal Glucocorticoid Analysis: Non-invasive Adrenal Monitoring in Equids
08:02

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Published on: April 25, 2016

Mild autonomous cortisol secretion: Diagnosis.

Leonor Pinto1, Sara Donato2

  • 1Endocrinology Department, Instituto Português de Oncologia de Lisboa Francisco Gentil, Lisbon, Portugal.

Vitamins and Hormones
|June 3, 2026
PubMed
Summary
This summary is machine-generated.

Mild autonomous cortisol secretion (MACS) is common in adrenal incidentalomas, causing health issues like heart disease and diabetes. Early diagnosis and tailored treatments are crucial for managing this condition.

Keywords:
Adrenocortical hyperfunctionAdrenocorticotropic hormoneCushing syndromeMild autonomous cortisol secretion

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Area of Science:

  • Endocrinology
  • Internal Medicine
  • Oncology

Background:

  • Mild autonomous cortisol secretion (MACS) is the most common hormonal abnormality in adrenal incidentalomas.
  • It involves cortisol hypersecretion independent of ACTH, without overt Cushing syndrome symptoms.
  • Even mild excess cortisol is linked to significant cardiometabolic and skeletal health problems.

Purpose of the Study:

  • To review current knowledge on MACS pathophysiology and genetics.
  • To discuss clinical consequences, diagnostic challenges, and treatment strategies.
  • To highlight the need for better risk stratification and research.

Main Methods:

  • Biochemical evaluation, primarily the 1-mg dexamethasone suppression test.
  • Confirmation of ACTH independence.
  • Review of existing literature on pathophysiology, clinical impact, diagnosis, and management.

Main Results:

  • MACS is associated with increased hypertension, type 2 diabetes, dyslipidemia, obesity, and skeletal fragility.
  • Current diagnostic tests have limitations.
  • Management is individualized, including surgery, conservative care, or medication.

Conclusions:

  • MACS poses significant health risks despite its mild presentation.
  • Accurate diagnosis and risk stratification remain challenging.
  • Further research, including prospective trials and biomarkers, is needed for optimal patient management.