What is benson's disease (posterior cortical atrophy) and its prognosis?

Different Alzheimers. Posterior cortical atrophy also called benson's syndrome, is most usually considered to be an atypical variant of alzheimer's disease. The disease causes atrophy of the back part of the cerebral cortex, resulting in the progressive disruption of complex visual processing.As the disease progresses, word finding, day-to-day memory and general cognitive functions may become affected.