Uptake of 99mTc-tetrofosmin, 99mTc-MIBI and 201Tl in malignant thymoma.
99mTc-tetrofosmin, Thallium-201-chloride (201Tl) and 99mTc-MIBI imagings were performed in a patient with malignant thymoma. Tracer uptake in the primary tumor was demonstrated. The tumor-to-background ratios of planar and SPECT imagings were 1.60 and 1.98 for 99mTc-tetrofosmin, 1.12 and 2.09 for 201Tl, and 1.19 and 1.80 for 99mTc-MIBI, respectively. In another patient 99mTc-tetrofosmin and 201Tl imagings were performed. Not only the primary tumor but also the direct invasions and metastatic lesions (bone metastases) were clearly detected. The tumor-to-background ratios of planar and SPECT imagings were 2.31 and 2.78 for 99mTc-tetrofosmin and 2.45 and 3.58 for 201Tl, respectively. In 99mTc-tetrofosmin scintigraphy we acquired delayed images, and the tumor-to-background ratios of planar and SPECT delayed images were 1.20 and 1.86, the retention ratios were -1.11 and -0.92 and the retention indices were -48.1 and -33.1, respectively. Our preliminary results suggest that 99mTc-tetrofosmin is useful in detecting not only the primary tumor but also metastatic lesions from malignant thymoma.
Hashimoto
T
T
Department of Radiology, Dokkyo University School of Medicine, Shimotsuga, Tochigi, Japan.
Goto
K
K
Hishinuma
Y
Y
Yachuda
K
K
Sugioka
Y
Y
Arai
K
K
Harada
S
S
Goto
M
M
D000368:Aged; D001859:Bone Neoplasms / Q000000981:diagnostic imaging / Q000556:secondary; D006801:Humans; D008297:Male; D009943:Organophosphorus Compounds; D015609:Organotechnetium Compounds; D017256:Technetium Tc 99m Sestamibi; D013794:Thallium Radioisotopes; D013945:Thymoma / Q000000981:diagnostic imaging* / Q000556:secondary; D013953:Thymus Neoplasms / Q000000981:diagnostic imaging*; D015899:Tomography, Emission-Computed, Single-Photon; D014057:Tomography, X-Ray Computed
D009943:Organophosphorus Compounds; D015609:Organotechnetium Compounds; D013794:Thallium Radioisotopes; C078700:technetium tc-99m tetrofosmin; D017256:Technetium Tc 99m Sestamibi