title: Comparison of 19-lodocholesterol and 6-lodomethylnorcholesterol as adrenal-scanning agents.
abstract: The two adrenal-specific compounds, 19-iodocholest-5-en-3beta-ol (19-iodocholesterol) and 6beta-iodometyly-19-norcholest-5(10)-en-3beta-ol (6-iodomethylnorcholesterol), synthesized pure in gram amounts have been labeled with iodine-125 and used for tissue-distribution studies in the rat. Radioactivity from 6-iodomethylnorcholesterol is accumulated in the rat adrenal gland at least 18 times more than is radioactivity from 19-iodocholesterol at 24 hr, and 50 times more at 72 hr. The use of radioactive 6-iodomethylnorcholesterol gave superior adrenal images in rats at earlier times than did radioactive 19-iodocholesterol, and the former should be equally superior when used in humans.
mesh_terms: D000307:Adrenal Gland Diseases / Q000175:diagnosis*; D000818:Animals; D002784:Cholesterol / Q000031:analogs & derivatives*; D007457:Iodine Radioisotopes; D008297:Male; D011877:Radionuclide Imaging; D051381:Rats
chemical_list: D007457:Iodine Radioisotopes; D002784:Cholesterol