In a 40-year-old man with elevated DHEA‑S, elevated afternoon cortisol, and low total testosterone, what is the next step in evaluation and management?

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Immediate Endocrinology Referral for Suspected Autonomous Cortisol Secretion

This 40-year-old man requires urgent endocrinology referral and confirmatory testing with a 1 mg dexamethasone suppression test (DST), as his elevated afternoon cortisol (62 nmol/L or ~2.2 mcg/dL) combined with elevated DHEA-S (593 mcg/dL) and low testosterone (215 ng/dL) strongly suggests autonomous cortisol secretion from an adrenal source.

Diagnostic Reasoning

Primary Concern: Autonomous Cortisol Secretion

The constellation of findings points toward mild autonomous cortisol secretion (MACS):

  • Elevated afternoon cortisol: While not a diagnostic test itself, an afternoon cortisol of 62 nmol/L (~2.2 mcg/dL) is concerning when it should be lower due to normal circadian rhythm 1
  • Elevated DHEA-S: At 593 mcg/dL, this is markedly elevated for a 40-year-old male and paradoxically suggests an adrenal source rather than pituitary-driven Cushing's disease 2, 3
  • Low testosterone: Hypercortisolism suppresses the hypothalamic-pituitary-gonadal axis, explaining the low testosterone 4

Critical Diagnostic Pattern

The elevated DHEA-S is the key discriminating feature here. In Cushing's disease (pituitary-driven), DHEA-S is typically normal or elevated due to ACTH stimulation 3. However, in adrenal adenomas causing autonomous cortisol secretion, DHEA-S is usually suppressed due to ACTH suppression 2, 3. The fact that this patient has both elevated cortisol AND elevated DHEA-S raises three possibilities:

  1. Adrenocortical carcinoma (ACC) - ACC commonly produces excess androgens including DHEA-S alongside cortisol 4
  2. ACTH-secreting pituitary microadenoma - Can show early DHEA-S elevation even before frank Cushing's develops 5
  3. Dual pathology - Less likely but possible

Immediate Next Steps

1. Confirm Autonomous Cortisol Secretion

Perform 1 mg overnight DST (take 1 mg dexamethasone at 11 PM, measure serum cortisol at 8 AM) 4, 1:

  • >138 nmol/L (>5 mcg/dL): Evidence of cortisol hypersecretion
  • 51-138 nmol/L (1.8-5 mcg/dL): Possible autonomous cortisol secretion
  • <50 nmol/L (<1.8 mcg/dL): Excludes cortisol hypersecretion

2. Measure Plasma ACTH

Check 8 AM plasma ACTH to determine if cortisol excess is ACTH-dependent or independent 4:

  • Suppressed ACTH (<5 pg/mL): Suggests adrenal source (adenoma or ACC)
  • Normal/elevated ACTH: Suggests pituitary source

3. Obtain Adrenal Imaging

Non-contrast CT of adrenals to evaluate for:

  • Adrenal mass characteristics (size, Hounsfield units)
  • Features concerning for ACC (>4 cm, >10 HU, irregular borders, heterogeneous enhancement) 4
  • Bilateral vs unilateral involvement

4. Additional Androgen Testing

Given the elevated DHEA-S and concern for ACC, measure 4:

  • Testosterone (already done - low at 215)
  • 17-OH progesterone
  • Androstenedione
  • 17β-estradiol

These help assess for virilization/feminization patterns seen in ACC.

Critical Pitfalls to Avoid

Do Not Assume Benign Adrenal Adenoma

The combination of elevated DHEA-S with cortisol excess is atypical for benign adenomas, which typically suppress DHEA-S 2, 3. ACC must be excluded given that it accounts for >50% of androgen hypersecretion cases 4.

Do Not Delay Imaging

If an adrenal mass >4 cm with concerning features is found, surgical evaluation should proceed urgently as ACC has poor prognosis without early intervention 4.

Do Not Interpret Random Cortisol Values

The afternoon cortisol of 62 nmol/L is suggestive but not diagnostic. Formal screening with DST, 24-hour urinary free cortisol, or late-night salivary cortisol is required 1.

Consider Cyclic Hypercortisolism

If initial DST is normal but clinical suspicion remains high, repeat testing may be needed as hypercortisolism can be intermittent 1.

Expected Management Path

If autonomous cortisol secretion is confirmed:

  • Unilateral adrenalectomy is indicated for functional adrenal lesions causing hormonal excess 4
  • Perioperative stress-dose glucocorticoids will be needed due to contralateral adrenal suppression
  • Post-operative monitoring for adrenal insufficiency is essential 4

If ACC is suspected:

  • Urgent surgical referral for oncologic adrenalectomy
  • Staging workup for metastatic disease
  • Consider adjuvant mitotane therapy post-operatively

The low testosterone will likely normalize after treating the underlying hypercortisolism and does not require separate testosterone replacement at this time 4.

References

1
Guideline

the diagnosis of cushing's syndrome: an endocrine society clinical practice guideline.

The Journal of clinical endocrinology and metabolism, 2008

3
Research

Serum dehydroepiandrosterone sulfate in Cushing's syndrome.

The Journal of clinical endocrinology and metabolism, 1984

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