A 79-year-old man presenting with gait disturbance and cognitive decline was diagnosed with intravascular large B-cell lymphoma (IVLBCL) by random skin biopsy. Some IVLBCL lesions were identified by PET examinations using 11C-methionine, 18F-FDG, and 18F-THK5351. 11C-methionine and 18F-FDG uptake, which likely reflects the presence of the lymphoma cells themselves, increased clearly in the left putamen but weakly in the left deep white matter. 18F-THK5351 uptake increased in all lesions, likely reflecting perivascular astrogliosis caused by IVLBCL. Hence, 18F-THK5351 PET can evaluate tumor extension in IVLBCL lesions wh ere 11C-methionine and 18F-FDG PET may fail in its visualization.
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