Tc-99m MIBI and TI-201 Uptake in a Benign Thymoma

Abstract

A 72-year-old man was admitted with exercise induced chest pain and dyspnea. Clinical and laboratory examination revealed coronary artery disease and a large, anterior mediastinal mass. A large area of increased activity was observed during TI-201 SPECT imaging in the left anterior mediastinum close to the anterior wall of the left ventricle. Tc-99m MIBI planar imaging showed radionuclide accumulation in the mass. CT and MRI confirmed the mediastinal mass. A biopsy showed a benign thymoma.