Which specialists should a patient with an adrenal adenoma be referred to?

Referral for Adrenal Adenoma

All patients with adrenal adenomas require multidisciplinary input from endocrinology, surgery, and radiology when hormone hypersecretion is detected, significant tumor growth occurs during follow-up, or when adrenal surgery is being considered. 1

Primary Endocrinology Referral

Refer to endocrinology for all patients with adrenal adenomas to ensure proper hormonal screening and risk stratification. 1, 2

• Every patient requires mandatory screening for autonomous cortisol secretion using a 1-mg overnight dexamethasone suppression test, regardless of imaging characteristics. 1
• Patients with hypertension and/or hypokalemia need screening for primary aldosteronism using the aldosterone-to-renin ratio. 1
• Those with lesions >10 HU on unenhanced CT or exhibiting adrenergic symptoms (episodic headaches, palpitations, sweating, severe hypertension) require pheochromocytoma screening with plasma or 24-hour urinary metanephrines. 1
• Clinical signs of virilization warrant testing for excess androgens to evaluate for possible adrenocortical carcinoma. 1

The evidence shows that only 26% of appropriate patients are initially referred to endocrinology in routine practice, leading to missed diagnoses of clinically significant lesions including Cushing's syndrome, pheochromocytoma, and Conn's syndrome. 3 This underscores the critical importance of systematic endocrine referral.

Surgical Referral Indications

Refer to surgery when any of the following conditions are met: 1

• Confirmed hormone hypersecretion:

  • Unilateral cortisol-secreting adenoma causing clinically evident Cushing's syndrome 1
  • Confirmed unilateral primary aldosteronism on adrenal venous sampling 1
  • Pheochromocytoma (after appropriate alpha-blockade) 1

• Imaging features suggesting malignancy:

  • Masses >4 cm with heterogeneity, local invasion, or necrosis 1
  • Lesions >20 HU carry a 6.3% risk of adrenocortical carcinoma 1
  • Indeterminate lesions showing significant growth on 3-6 month follow-up imaging 1

• Mild autonomous cortisol secretion (MACS) with relevant comorbidities:

  • Patients with post-dexamethasone cortisol >50 nmol/L (>1.8 µg/dL) who have cortisol-related comorbidities (hypertension, type 2 diabetes, metabolic abnormalities) should be considered for surgery in an individualized approach. 2, 4

Radiology Consultation

Involve radiology for: 1, 5

• Interpretation of imaging characteristics to determine malignancy risk (HU values, washout patterns, chemical-shift MRI findings) 1
• Planning and performing adrenal venous sampling when primary aldosteronism is suspected and confirmed by positive aldosterone-to-renin ratio 1, 5
• Guidance on appropriate follow-up imaging intervals for indeterminate lesions 1

Radiologist recommendations in imaging reports significantly influence whether patients receive appropriate follow-up—action is more likely when specific recommendations are provided. 3

Common Pitfalls to Avoid

• Do not skip hormonal screening based on benign imaging alone: Even lesions ≤10 HU require screening for autonomous cortisol secretion, as up to 30-50% of adrenal incidentalomas may have mild autonomous cortisol secretion. 6
• Do not biopsy suspected adrenocortical carcinoma: This is contraindicated due to risk of tumor seeding along the needle tract. 1
• Do not perform adrenal venous sampling before confirming positive aldosterone-to-renin ratio: AVS should only be done after biochemical confirmation to differentiate unilateral from bilateral disease. 1
• Do not discharge patients with benign-appearing, non-functioning adenomas without establishing follow-up: These patients require annual hormonal screening for autonomous cortisol secretion for four years. 1