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Related Experiment Videos

Venous ACTH sampling in Cushing's syndrome.

S J Grant, J N Stiel, W A Sorby

    The Medical Journal of Australia
    |April 2, 1983
    PubMed
    Summary

    This case study highlights a diagnostic challenge in Cushing's syndrome. Selective petrosal sinus sampling confirmed a pituitary source of excess adrenocorticotropic hormone (ACTH) despite initial ambiguous imaging.

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    Area of Science:

    • Endocrinology
    • Diagnostic Imaging
    • Internal Medicine

    Background:

    • Cushing's syndrome is characterized by prolonged exposure to high cortisol levels.
    • Differentiating pituitary causes from other sources of excess adrenocorticotropic hormone (ACTH) can be challenging.
    • High-dose dexamethasone suppression testing is a standard diagnostic tool.

    Observation:

    • A 36-year-old woman presented with persistent hypercortisolism despite high-dose dexamethasone.
    • Skull X-rays showed an enlarged pituitary fossa with ambiguous features, raising concerns about anatomical variation.
    • Peripheral and petrosal sinus ACTH levels were measured to localize the source of hormone excess.

    Findings:

    • Selective catheterization revealed significantly elevated ACTH levels in the left petrosal sinus compared to peripheral blood.
    • This finding localized the source of ACTH hypersecretion to the pituitary gland.
    • The diagnosis of Cushing's disease was confirmed, despite initial imaging uncertainty.

    Implications:

    • Selective petrosal sinus sampling is crucial for diagnosing ACTH-dependent Cushing's syndrome when imaging is equivocal.
    • Accurate localization of ACTH sources is vital for appropriate treatment and management of Cushing's syndrome.
    • This case underscores the importance of integrated diagnostic approaches in complex endocrine disorders.

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