Detection of Metastatic Adrenal Carcinoma Using¹³¹I-6-β-Iodomethyl-19-Norcholesterol Total Body Scans

Abstract

Adrenal and total body scintigraphs with 131I-6-beta-iodomethyl-19-norcholesterol were obtained in 5 patients who had had prior resection of adrenal cortical carcinoma. The results were compared with roentgenographic findings and liver, bone, and total body gallium-67 citrate scintigraphs. Metastatic lesions were detected with radiolabeled cholesterol in 4 of 5 patients, including 3 liver metastases, 2 bone metastases, and 1 lung metastasis. These lesions were also demonstrated by one or more of the other diagnostic modalities. All initial findings were negative in a fifth patient, who developed brain metastases within two months. The 6-methyl-analog of iodocholesterol makes it possible to detect metastatic adrenocortical carcinoma with total body scans. Whether or not this agent is "tumor specific" and will be of significant clinical utility will have to be determined more fully in a larger series of patients.