TC-99M SESTAMIBI UPTAKE BY MALIGNANT-LYMPHOMA AND SLOW WASHOUT

Tc-99m sestamibi has been used to detect primary brain tumors, lung tu mors, and breast cancers. The authors report a patient who had superio r vena cava (SVC) syndrome and underwent Tc-99m sestamibi and Tl-201 S PECT to differentiate the tumor from thrombus in the mediastinum becau se of an abnormal mass lesion on a contrast enhanced CT scan. An abnor mal area of increased Tc-99m sestamibi uptake in the supra azygos area was demonstrated on early and delayed SPECT imaging. The washout of t umor uptake was slow. The removed tumor was confirmed to be malignant lymphoma.