Management Approach of Adrenal Incidentaloma.

Area of Science:

• Endocrinology
• Oncology
• Radiology

Background:

• Adrenal incidentalomas are increasingly detected via imaging, posing a challenge due to the low but significant risk of malignancy and the prevalence of functioning tumors.
• While most are benign, identifying rare adrenocortical carcinoma is critical due to its poor prognosis.
• Functioning adrenal tumors, including mild autonomous cortisol secretion (MACS), primary aldosteronism, and pheochromocytomas, are found in a significant portion of incidentalomas.

Purpose of the Study:

• To present a systematic, three-pillar diagnostic framework for managing adrenal incidentalomas.
• To outline evidence-based criteria for imaging, hormonal testing, and growth assessment.
• To highlight the evolving paradigm in managing MACS towards surgical intervention for improved outcomes.

Main Methods:

• A comprehensive literature review on adrenal incidentaloma management.
• Implementation of a three-pillar diagnostic framework: imaging (Hounsfield units, contrast washout), hormonal testing (cortisol, aldosterone, catecholamines), and growth surveillance.
• Analysis of diagnostic criteria for malignancy risk and specific hormonal syndromes.

Main Results:

• Imaging characteristics effectively stratify risk: lesions <10 HU are benign, 10-20 HU are indeterminate (0.5% malignancy risk), and >20 HU are suspicious (6.3% risk).
• Specific hormonal tests diagnose MACS (1-mg dexamethasone suppression test), overt Cushing's syndrome, primary aldosteronism (Aldosterone-Renin Ratio >30), and pheochromocytoma (plasma-free metanephrines).
• A growth rate >0.8 cm/year is a predictor of malignancy.

Conclusions:

• A comprehensive evaluation using imaging, hormonal testing, and growth surveillance provides a robust framework for adrenal incidentaloma management.
• Recent evidence supports surgical intervention for carefully selected MACS patients, showing improved cardiovascular and metabolic outcomes.
• The management of adrenal incidentalomas has shifted towards addressing underlying autonomous cortisol production surgically, with minimally invasive adrenalectomy as the preferred approach.