Management of Small Adrenal Adenomas

Initial Evaluation

• The American College of Radiology recommends that adrenal adenomas measuring less than 3 cm have a very low risk of malignancy and are typically benign 1, 2
• The National Comprehensive Cancer Network suggests that before concluding observation is appropriate, confirm the lesion has benign imaging characteristics, including homogeneous appearance and well-defined margins 3
• The Journal of Urology states that if the lesion has attenuation >10 HU on non-contrast CT, second-line imaging with either washout CT or chemical shift MRI should be performed to confirm benign nature 4, 5

Functional Assessment

• The National Comprehensive Cancer Network recommends that despite benign radiographic appearance, all adrenal incidentalomas should undergo hormonal evaluation to exclude subclinical hormone production, including plasma aldosterone and renin activity, overnight 1 mg dexamethasone suppression test or midnight salivary cortisol, and plasma-free metanephrines or 24-hour urinary metanephrines 3, 6

Management Algorithm

• The Journal of Urology recommends that for non-functioning adenomas <3 cm with benign imaging characteristics, no further follow-up imaging or functional testing is required 4, 6
• The National Comprehensive Cancer Network suggests that for functioning adenomas, laparoscopic adrenalectomy is recommended for cortisol-secreting and aldosterone-secreting adenomas, and adrenalectomy after appropriate alpha-blockade for pheochromocytoma 3, 6, 7

Important Considerations

• The American College of Radiology states that the risk of primary adrenal cortical carcinoma in patients with adrenal masses is approximately 4.7%, but much lower for masses <3 cm 1
• The American College of Radiology recommends that adrenal biopsy should be reserved only for cases where noninvasive techniques are equivocal and there is high suspicion for metastatic disease 1, 5

Common Pitfalls to Avoid

• The Journal of Urology warns that overdiagnosis and overtreatment of small adrenal adenomas can lead to unnecessary procedures and patient anxiety 4
• The American College of Radiology notes that failure to perform hormonal evaluation may miss subclinical hormone production, which occurs in approximately 5% of incidentalomas 5

Special Situations

• The American College of Radiology recommends that in patients with a history of malignancy, even small adrenal lesions warrant closer evaluation as the risk of metastatic disease is significantly higher (25-72% depending on primary tumor type) 1, 2