This essay will discuss the form of Posterior Cortical Atrophy of Alzheimer's Dementia, from aspects of Sir Terry Pratchett's journey. Furthermore, the essay will discuss the symptoms of the disease, pathology, anatomical structures and locations. Sir Terry Pratchett (Pratchett, 2013) opened a discussion on dementia due to his diagnosis of posterior cortical atrophy (PCA). PCA is a type of condition associated with Alzheimer's disease (AD) that affects the parietal and occipital lobes, damaging the way the brain is able to process and understand visual information. This deterioration in visual processing can impact the person with PCA on how the person can carry out daily activities such as reading, driving or even walking in certain situations such as dimly lit stairs (Shakespeare, 2013). Sir Pratchett explains that he is still able to write and with help is still producing novels. He further states: “There is no clearly mapped out path for the course of these diseases. Dementia attacks those aspects that make us who we are, and it is a deeply personal attack that defies prediction” (Pratchett, 2013). Sir Pratchett discusses how PCA affects visual acuity and the ability to topographically map a situation, however he goes on to say that PCA does not completely rob you of your ability to communicate at a logical conversational level that allows the person with PCA to hide their dementia symptoms reasonably well (Terry Pratchett - Living with dementia (Part 2/4), 2008). In one case study, people with PCA experienced progressive visual cognitive problems where they had problems with object identification, visual matching, and visual construction. It was also found that people had problems processing the...... middle of the paper ...... parts of the brain. [Online]Available at: http://www.brighthubeducation.com/science-homework-help/61901-brain-anatomy-study-guide/[Accessed 18 December 2013].Stedmans Medical Dictionary and Lippincott Williams & Wilkins, 2006. Medical Dictionary, Medical Terminology. [Online]Available at: http://www.medilexicon.com/medicaldictionary.php[Accessed December 2013].Terry Pratchett - Living with dementia (Part 2/4). 2008. [Film] Directed by the Alzheimer's Society. United Kingdom: Alzheimer's Society.Weerakkody, Y. & Gaillard, F., 2005-2013. Neuritic plaques. [Online]Available at: http://radiopaedia.org/articles/neuritic-plaques[Accessed 18 December 2013].Yan, R., 2011-2012. Lattice 3 aggregation and its role in the formation of dystrophic neurites. [Online]Available at: http://www.biomedcentral.com/content/pdf/1750-1326-7-S1-L23.pdf[Accessed 18 December 2013].