title: Synthesis of radioiodinated metyrapone--a potential adrenal imaging agent.
abstract: Metyrapone has been labelled with radioiodine selectively in the 4'-position of ring B. The synthesis of 123I-(131)-metyrapone involves four intermediate compounds. 4'-Bromo-metyrapone serves as a stable precursor that is labelled before use. Studies of the biodistribution of [131I]metyrapone in rats indicate the highest concentration in the adrenal gland 10 min after the injection with a fast elimination of the radioactivity. However, the absolute uptake in the normal adrenal is low. When [123I]metyrapone was used in a patient with bilateral hyperplasia, faint adrenal images were obtained.
mesh_terms: D000311:Adrenal Glands / Q000000981:diagnostic imaging; D000818:Animals; D003480:Cushing Syndrome / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D007457:Iodine Radioisotopes; D007553:Isotope Labeling / Q000379:methods; D008797:Metyrapone / Q000378:metabolism; D011877:Radionuclide Imaging; D051381:Rats; D014018:Tissue Distribution
chemical_list: D007457:Iodine Radioisotopes; D008797:Metyrapone