I-MIBG scan showing intensive uptake in the adrenal mass but no uptake in the lung. A 123I-MIBG scan was obtained to determine whether the left adrenal mass and right lung mass are pheochromocytoma. Shown are the frontal and back views of the total body scan at 72 hours. Significantly increased uptake is seen in the left adrenal lesion. No uptake was found in the lung. Physiological uptake is seen in the salivary glands, heart and liver. 123I-MIBG is renally excreted and is visible in the bladder.