Tl-201 and Ga-67 scintigraphy in non-Hodgkin's lymphoma.

Ga-67 scintigraphy is routinely used to stage and monitor non-Hodgkin's lymphoma (NHL). It is highly sensitive in high-grade NHL but less so in intermediate- and low-grade NHL. Several studies have reported the use of Tl-201 in the low and intermediate grades of NHL and found it superior in low-grade NHL. In this study, the authors evaluated the utility of combined Ga-67 and Tl-201 scintigraphy in low, intermediate, and unusual types of NHL. Combined Tl-201 and Ga-67 scintigraphy were done in 33 patients (18 women, 15 men; age range, 21-91 years; mean age, 56 years). Tl-201 and Ga-67 had similar overall patient sensitivity in the 33 patients studied. However, the use of both agents increased the overall patient sensitivity from 67% (for Ga-67 only) to 82% and improved the overall site detection from 59 positive sites with Ga-67 to 81 abnormal sites with both Tl-201 and Ga-67. The combined use of Tl-201 and Ga-67 scintigraphy in low- and intermediate-grade NHL resulted in increased disease and site detection and is beneficial for clinical follow-up.