In a 77-year-old male with a 1.8 cm right adrenal adenoma, elevated 24‑hour urine cortisol, and a dexamethasone suppression test that fails to suppress cortisol to the normal range despite an adequate dexamethasone level, should the adenoma be surgically removed?

Surgical Removal is Recommended for This Cortisol-Secreting Adenoma

This 77-year-old patient should undergo unilateral adrenalectomy of the right adrenal gland, preferably via minimally invasive surgery. The biochemical profile demonstrates autonomous cortisol secretion (mild autonomous cortisol secretion, MACS) with a post-dexamethasone cortisol of 13.8 μg/dL (380 nmol/L)—far exceeding the 1.8 μg/dL (50 nmol/L) threshold that defines cortisol autonomy—and the adequate dexamethasone level of 202 ng/mL confirms this is true non-suppression, not a false positive from inadequate drug absorption 1.

Why Surgery is Indicated

The current guidelines are clear on this matter:

• Patients with unilateral cortisol-secreting adrenal masses and evidence of autonomous cortisol secretion should undergo unilateral adrenalectomy 1
• The 2023 CUA/AUA guidelines specifically state that "patients with unilateral cortisol-secreting adrenal masses and clinically apparent Cushing's syndrome should undergo unilateral adrenalectomy of the affected adrenal gland" 1

The Biochemical Evidence is Definitive

Your patient's dexamethasone suppression test (DST) shows:

• Post-DST cortisol of 13.8 μg/dL (far above the 1.8 μg/dL cutoff for normal suppression)
• Dexamethasone level of 202 ng/mL confirms adequate drug absorption 2
• This eliminates false-positive results from drug interactions or malabsorption

The 24-hour urine cortisol of 60 μg (assuming normal range ~4-50 μg) is mildly elevated, supporting autonomous secretion. Post-dexamethasone cortisol >1.8 μg/dL defines mild autonomous cortisol secretion (MACS), and levels >5 μg/dL establish clinically significant autonomous cortisol secretion 3, 4. At 13.8 μg/dL, this patient clearly has significant cortisol autonomy.

Age Considerations and Surgical Risk

While the patient is 77 years old, age alone should not preclude surgery if the patient is otherwise a reasonable surgical candidate 1. The guidelines emphasize that:

• Younger patients with MACS and progressive metabolic comorbidities should be considered for adrenalectomy after shared decision-making 1
• However, the strength of indication increases with the degree of cortisol excess
• At cortisol levels of 13.8 μg/dL post-DST, this represents substantial autonomous secretion

The critical question is whether this patient has cortisol-related comorbidities (hypertension, diabetes, osteoporosis, cardiovascular disease) that could improve with surgery 4. Research demonstrates that patients with MACS have increased morbidity and mortality, particularly from cardiovascular disease and metabolic complications 5, 6.

Surgical Approach

Minimally invasive surgery (laparoscopic adrenalectomy) should be performed when feasible 1. For a 1.8 cm adenoma, laparoscopic approach is ideal and associated with:

• Lower morbidity than open surgery
• Faster recovery
• Adequate for benign-appearing lesions <6 cm

Critical Perioperative Management

This patient will require glucocorticoid replacement postoperatively 7. The high post-DST cortisol indicates the contralateral adrenal is suppressed:

• Expect postoperative adrenal insufficiency requiring hydrocortisone replacement 8, 6
• Start stress-dose steroids perioperatively
• Taper gradually over months as the hypothalamic-pituitary-adrenal axis recovers
• Monitor morning cortisol levels to guide steroid withdrawal 7

Research shows that 4 of 7 patients with cortisol-producing incidentalomas developed temporary adrenal insufficiency after surgery 6, and case reports document adrenal crises even in patients without overt Cushing's syndrome 8.

Expected Outcomes

After successful surgery, expect:

• Improvement in hypertension (if present) 6
• Better glycemic control (if diabetic) 6
• Weight loss (if obese) 6
• Reduced cardiovascular risk 4
• Resolution of other subtle cortisol-related comorbidities

Morning cortisol values should be ≤1.8 μg/dL after resecting an adrenal adenoma, confirming successful removal 7.

The Alternative (Non-Surgical Management)

If surgery is declined or contraindicated due to severe comorbidities:

• Annual clinical screening for worsening cortisol-related comorbidities 1
• Aggressive management of hypertension, diabetes, and osteoporosis
• Repeat imaging at 6-12 months, then as clinically indicated 1
• Repeat hormonal testing annually 3

However, given the degree of cortisol excess (13.8 μg/dL post-DST), conservative management accepts ongoing exposure to harmful cortisol levels and their associated morbidity and mortality.

Common Pitfalls to Avoid

1. Don't dismiss this as "subclinical" based on lack of obvious Cushingoid features—MACS still causes significant morbidity 4
2. Don't forget perioperative steroid coverage—adrenal crisis is a real risk 8
3. Don't assume the dexamethasone level is irrelevant—it confirms true non-suppression 2
4. Don't delay surgery in appropriate candidates—cortisol-related damage is progressive 5, 6