Incidentally discovered adrenal tumors: endocrine and scintigraphic correlates

The Journal of Clinical Endocrinology and Metabolism
L BarzonM Boscaro

Abstract

Hormonal and morphological data were investigated in 202 consecutive patients with adrenal incidentalomas (171 unilateral and 31 bilateral) in an attempt to assess subclinical hyperfunction or malignancy. In addition to the classical evaluation, scintiscan was carried out in a large number of these patients. In unilateral incidentalomas, 83% showed normal hormonal function, whereas 17% had biochemical signs of adrenal overactivity (hyperaldosteronism in 3, hypercortisolism in 17, medullary hyperfunction in 9). [75Se]Methylnorcholesterol scintigraphy depicted malignant, space-occupying lesions as decreased or absent radiotracer uptake by the mass, and cortical adenomas as increased or normal uptake. In cortical adenomas a relationship between radiocholesterol uptake and degree of functional autonomy was demonstrated. [123I]Metaiodobenzilguanidine scintiscan visualized 7 of 8 pheochromocytomas. In bilateral incidentalomas, abnormal adrenal function was more frequent, accounting for 29% of cases (hyperaldosteronism in 3, hypercortisolism in 3, adrenal insufficiency in 2, and congenital adrenal hyperplasia in 1). Malignant lesions were not scintigraphically visualized. [75Se]Methylnorcholesterol scan also provided functional inform...Continue Reading

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