We report a 64-year-old man with diabetic chorea whom we investigated with dopamine transporter SPECT, 18F FDG PET, 99mTc ethylcysteinate dimer (ECD) SPECT, and 123I metaiodobenzylguanidine (MIBG) scintigraphy. Dopamine transporter SPECT revealed reduced 123I ioflupane binding in the bilateral striatum. 18F FDG PET showed metabolic dysfunction in the bilateral striatum, as shown in earlier studies. 99mTc ECD SPECT revealed reduced brain perfusion in the bilateral caudate nucleus and putamen. 123I MIBG scintigraphy revealed no cardiac sympathetic nerve dysfunction. Our case suggests a possible nigrostriatal presynaptic dopaminergic involvement in diabetic chorea.