pancreatic parenchymal atrophycerebral parenchymal atrophydiffuse parenchymal atrophyglobal parenchymal atrophybrain parenchymal atrophyparenchymal atrophyneuro parenchymal atrophymild parenchymal atrophybrain parenchymal volume lossdiffuse parenchymal volume loss brainmild brain parenchymal volume lossparenchymal volume