[Sorokin]

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"Available evidence suggests that an overnight (1-mg) dexamethasone suppression test and determination of fractionated urinary or plasma metanephrines should be performed. Exceptions would include patients with imaging characteristics of myelolipoma or an adrenal cyst. In patients with hypertension, serum potassium and a plasma aldosterone concentration–plasma renin activity ratio should be determined to evaluate for primary aldosteronism"

Другое дело, что на тактику ведения может повлиять объём образования (исходно 3 см, а сколько сейчас?)
Анализ 2066 случаев опухолей надпочечников (полнотекстовой статьи нет в свободном доступе):
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"We suggest (1) biochemical screening in patients with incidentalomas larger than 1 cm, (2) surgical excision of tumors 4 cm or greater, and (3) a comparison CT scan approximately 3 months after diagnosis in patients with tumors less than 4 cm in whom observation has been chosen"