Brain images of the patient. Compared to the brain CT, ¹⁸F-FP-CIT PET/CT demonstrated asymmetrically decreased FP-CIT uptake in the bilateral posterior putamen (A, B). Also, it revealed an unusual increased CIT uptake in ¹⁸F-FP-CIT PET/CT at same region where hypodense lesion is observed in the cortico-subcortical region of the right occipital lobe (C, D, white and black arrow). Diffusion-weighted MR images showed restricted diffusion with reduced apparent diffusion coefficient in the corresponding area (E, F, white arrow). In contrast, the hypodense lesion in the left temporal lobe does not show increased CIT uptake or diffusion restriction and is a finding of chronic infarction on brain CT (C, red arrow). CT; computed tomography, ¹⁸F-FP-CIT; ¹⁸F-fluorinated-N-3-fluoropropyl-2-b-carboxymethoxy-3-b-(4-iodophenyl) nortropane, PET; positron emission tomography, MR; magnetic resonance.