Typical Alzheimer's disease is diagnosed when there are problems with memory, language, visuospatial functioning and executive resources. Microscopic inspection of the brain often reveals the accumulation of misfolded proteins known as tau and amyloid. There are also atypical presentations of Alzheimer's disease. These conditions have similar microscopic changes, but these changes often do not involve memory portions of the brain. Instead, the microscopic changes are often restricted to brain regions important for language or visuospatial functioning or executive resources. These atypical presentations of Alzheimer's disease often occur in younger individuals, and they are frequently confused with frontotemporal degeneration.