AtrophyBrainMagnetic Resonance ImagingMuscular AtrophyCognition DisordersAlzheimer DiseaseBrain InjuriesBrain MappingCerebral VentriclesBrain ChemistryOptic AtrophyMuscular Atrophy, SpinalNeuropsychological TestsBrain DiseasesImage Processing, Computer-AssistedBrain NeoplasmsAgingMultiple SclerosisDisease ProgressionMild Cognitive ImpairmentNeuroimagingMultiple System AtrophyLeukoaraiosisDementiaOrgan SizeCerebral CortexLeukoencephalopathiesCognitionLongitudinal StudiesNeurodegenerative DiseasesSpinal Muscular Atrophies of ChildhoodMultiple Sclerosis, Chronic ProgressivePick Disease of the BrainSeverity of Illness IndexMultiple Sclerosis, Relapsing-RemittingFrontotemporal Lobar DegenerationHippocampusLateral VentriclesHuntington DiseaseTime FactorsApolipoprotein E4Disease Models, AnimalImaging, Three-DimensionalOlivopontocerebellar AtrophiesTemporal LobeNerve Fibers, MyelinatedImage Interpretation, Computer-AssistedBrain StemCerebrovascular CirculationBrain EdemaNerve DegenerationFollow-Up StudiesTomography, X-Ray ComputedBrain IschemiaGyrate AtrophyNeuronsCerebellumAmyloid beta-PeptidesReproducibility of ResultsAnalysis of VarianceCohort StudiesFrontal LobeProspective StudiesCase-Control StudiesNerve Tissue ProteinsAge FactorsPlaque, AmyloidGeographic Atrophytau ProteinsCross-Sectional StudiesDementia, VascularExecutive FunctionCerebral InfarctionRisk FactorsTreatment OutcomeMemory DisordersThalamusBiological MarkersDepressionBrain AbscessAge of OnsetAutopsyMemorySymptom AssessmentDiffusion Magnetic Resonance ImagingSensitivity and SpecificitySurvival of Motor Neuron 1 ProteinFunctional LateralitySample SizeImage EnhancementAlcoholismSex CharacteristicsMuscular Disorders, AtrophicStatistics as TopicIntelligence TestsCerebrovascular DisordersPositron-Emission TomographyNeuroprotective AgentsSex FactorsPredictive Value of Tests