Cited by 72Adrenal and Paraganglionic TumorsAdrenal Hormones and DisordersHormonal Regulation and Hypertension

131I‐6β‐Iodomethylnorcholesterol scintigraphy: an assessment of its role in the investigation of adrenocortical incidentalomas

Bardet, Stéphane, Rohmer, Vincent, Murat, Arnaud, Guillemot, Christian, Maréchaud, Richard, Chupin, Maurice, Lecomte, Pierre, Simon, Dominique, Delemer, Brigitte, Schneebelli, Stéphane, Beutter, Didier, Jacquin, Vincent, Peltier, Patrick, Charbonnel, Bernard, the West France Study Group on Incidentalomas (WFSGI)·1996·Clinical Endocrinology

Abstract

OBJECTIVE: Most incidentally discovered adrenal tumours ('incidentaloma') are benign adrenocortical adenomas. It has been suggested that 131I-6 beta-iodomethylnorcholesterol (IMC) scan could specify the degree of functional autonomy of such adenomas depending on whether they prevent contralateral adrenal tracer uptake. Our purpose was to examine this hypothesis in a correlated scintigraphic and endocrine study. DESIGN: Prospective study evaluating the prevalence of unilateral IMC uptake (tumour uptake with no visualization of the contralateral adrenal gland) and bilateral uptake (uptake in both the tumoral and the contralateral adrenal glands) in patients with unilateral incidentaloma. Comparison of adrenocortical function and of IMC scan after dexamethasone (DXM) in the two scintigraphic groups thus defined. PATIENTS: Thirty-five patients with a unilateral mass highly suggestive of benign adrenocortical adenoma on CT scan. MEASUREMENTS: The IMC scan was performed in basal conditions (baseline scan) and after DXM (suppression scan). Adrenocortical function assessment included basal measurements of 11-deoxycortisol, 17 alpha-hydroxyprogesterone (17-OHP), dehydroepiandrosterone sulphate (DHEAS), plasma cortisol and ACTH, urinary free cortisol (UFC), overnight and low-dose DXM suppression test, and CRH test. RESULTS: The baseline scan showed 16 patients (46%) with unilateral uptake (group A) and 19 (54%) with bilateral uptake (group B). Patients in group A exhibited lower ACTH values at 0800h (P = 0.05) and higher cortisol values after an overnight DXM suppression test (P = 0.02), than did patients in group B. In addition, 3 patients in group A failed the overnight and the low-dose DXM suppression tests. Adrenal masses were larger in group A than group B (P = 0.04) and an inverse correlation was found in the whole population between tumour size and ACTH value at 0800h (P = 0.05). On the suppression scan performed in 14 patients (7 in each group), patients in group A continued to exhibit unilateral tumour uptake and bilateral uptake was suppressed in 72% of patients in group B. An adrenal mass was removed in 3 patients of group A with confirmed benign adrenocortical adenomas. In the post-surgical period, the contralateral gland was again visualized in a baseline scan and the hormonal evaluation returned to the normal range. CONCLUSION: Unilateral 131I-6 beta-iodomethylnorcholesterol tumour uptake is a frequent feature in benign adrenocortical adenomas. Hormonal data and scintigraphic profiles obtained after dexamethasone, as well as hormonoscintigraphic changes observed after surgery, provide evidence that unilateral uptake is related to functioning adenomas with various degrees of autononomy and suggest that the 131I-6 beta-iodomethylnorcholesterol scan could be a valuable tool for screening 'subclinical' Cushing's adenomas.

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Crossref · 10.1046/j.1365-2265.1996.720541.x

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  • The 1-mg dexamethasone suppression test is the most used test for diagnosing subclinical hypercortisolism.

    “To date, the 1-mg DST is the most used test to diagnose SH, either alone (34 -36, 38, 44 -46) or in combination with other parameters (9, 18, 21, 32, 37, 39, 42, 49, 52-54, 56, 60, 61).”

    From Diagnosis and Treatment of Subclinical Hypercortisolism (2011) · cites this paper as [38]

  • Several studies and the French Society for Endocrinology have proposed a lower 1-mg dexamethasone suppression test cutoff to increase sensitivity.

    “Several studies (19,21,32,34,38,39,44,46,49,53,60,61,67) and recently the French Society for Endocrinology (68), however, have proposed a lower cutoff to increase sensitivity.”

    From Diagnosis and Treatment of Subclinical Hypercortisolism (2011) · cites this paper as [38]

  • Determining ACTH levels after CRH does not add any advantage to screening for subclinical hypercortisolism.

    “The determination of ACTH levels after CRH does not seem to add any advantage (1,23,34,35,37,38,46) to screening for SH.”

    From Diagnosis and Treatment of Subclinical Hypercortisolism (2011) · cites this paper as [38]

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Authors
Bardet, S., Rohmer, V., Murat, A., Guillemot, C., Maréchaud, R., Chupin, M., Lecomte, P., Simon, D., Delemer, B., Schneebelli, S., Beutter, D., Jacquin, V., Peltier, P., Charbonnel, B., & the West France Study Group on Incidentalomas (WFSGI)
Affiliations
Centre François Baclesse (FR)
Venue
Clinical Endocrinology
Publisher
Wiley
Published
1996-05
Volume
44
Issue
5
Pages
587-596
ISSN
  • 0300-0664 (ISSN-L)
  • 1365-2265
OpenAlex
W2008084707
Cited by
71
References
0
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2022: 1 · 2020: 4 · 2016: 1 · 2015: 1 · 2014: 3 · 2012: 2
FWCI
4.16
Type
journal article
Language
en
Open access
closed
Locations
  • Clinical Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
Funders
U.S. Department of Energy
Topics
  • Health Sciences › Medicine › Surgery › Adrenal and Paraganglionic Tumors
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adrenal Hormones and Disorders
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Hormonal Regulation and Hypertension
Keywords
adrenal adenoma, functional autonomy, dexamethasone suppression test, ACTH, cortisol, 17-hydroxyprogesterone, 11-deoxycortisol, dehydroepiandrosterone sulfate, urinary free cortisol
MeSH terms
Adenoma, Adosterol, Adrenal Cortex, Adrenal Cortex Neoplasms, Adrenocorticotropic Hormone, Aged, Corticotropin-Releasing Hormone, Dexamethasone, Female, Humans, Hydrocortisone, Iodine Radioisotopes, Male, Middle Aged, Predictive Value of Tests, Prospective Studies, Radionuclide Imaging

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