What is Posterior Cortical Atrophy disease?
Posterior cortical atrophy (PCA) refers to gradual and progressive degeneration of the outer layer of the brain (the cortex) in the part of the brain located in the back of the head (posterior). It is not known whether PCA is a unique disease or a possible variant form of Alzheimer’s disease. In many people with PCA, the affected part of the brain shows amyloid plaques and neurofibrillary tangles, similar to the changes that occur in Alzheimer’s disease but in a different part of the brain. In other people with PCA, however, the brain changes resemble other diseases such as Lewy body dementia or a form of Creutzfeld-Jacob disease. Most cases of Alzheimer’s disease occur in people age 65 or older, whereas the onset of PCA commonly occurs between ages 50 and 65.