LOCALIZATION OF TC-99M SESTAMIBI AND TL-201 IN AN UNSUSPECTED CALCIFIED INTRATHORACIC MASS

Tc-99m MIBI and TI-201 uptake have been reported in benign and maligna nt lesions. However, concordant uptake of both radiotracers has been d escribed infrequently. The authors report a patient with a case histor y of tuberculosis and breast cancer who underwent a TI-201 cardiac str ess/planar study initially for complaints of angina pectoris, and 3 ye ars later a follow-up Tc-99m MIBI cardiac study was completed for simi lar complaints. These studies incidentally revealed uptake of TI-201 a nd Tc-99m MIBI in a large left lung mass unchanged in size between the two studies. CT with intravenous contrast performed 2 months after th e Tc-99m MIBI study revealed a 9 cm calcified soft-tissue mass in the left lung with adjacent pleural calcifications.