GBA1 and Parkinson disease: Investigation of metabolic networks in GBA1-PD patients using [18F]-FDG PET (fluorodeoxyglucose-positron emission tomography) has shown increased PD-related pattern (PDRP), PD-related cognitive pattern (PDCP) levels and significant [18F]-FDG PET hypoactivity in the parietal lobe, reflecting higher cognitive burden compared with non-carriers [108,109].