Dual phase ¹⁸F-FP CIT PET and ^99mTc- ECD SPECT findings of Huntington's disease

Fluorine-18 N-3-fluoropropyl-2-beta-carboxymethoxy-3-beta-(4-iodophenyl) nortropane (¹⁸F- FP CIT) has been used for the differential diagnosis of atypical parkinsonian disorders, and Technetium 99m ethyl cysteinate dimer (^99mTc- ECD) has been used for evaluation of cerebral blood flow. A 60-year-old female with a history of Huntington's disease (HD) with full mutation of cytosine-adenine-guanine (GAG) 18/43 repeats underwent early and late ¹⁸F- FP CIT positron emission tomography/computed tomography (PET/CT) and ^99mTc- ECD single-photon emission computed tomography (SPECT). The ¹⁸F-FP CIT PET/CT showed decreased uptake in both basal ganglia, both frontal and parietotemporal lobes at early images, and decreased presynaptic dopamine transporter (DAT) binding in both ventral & posterior putamen at late images. ^99mTc- ECD SPECT showed decreased perfusion in both basal ganglia, both frontal and temporal lobes. Early ¹⁸F- FP CIT PET/CT and ^99mTc- ECD SPECT images showed similar findings in Huntington's disease.