diffuse cortical atrophy symptomsparenchymal atrophy definitiondiffuse cerebral cortical atrophymoderate diffuse cortical atrophydiffuse cortical atrophy brainpancreatic parenchymal atrophycerebral parenchymal atrophymild diffuse cortical atrophyglobal parenchymal atrophybrain parenchymal atrophymild diffuse cerebral cortical atrophyneuro parenchymal atrophy