Mr P is a 93-year-old bachelor who has lived in the United States since emigrating from Mexico at age 8. He began to have memory problems 13 years ago such as forgetting why he walked into a room or whether he had taken his medications. Mr P sought treatment in 2004 and scored 29 of 30 points on the Mini-Mental State Examination (MMSE; normal cognition score Ͼ24). His memory impairment, coupled with results from brain computed tomography showing white matter changes and bilateral and frontotemporal atrophy, led to diagnosis of mild cognitive impairment due to brain vascular disease. By 2010, Mr P's score had declined by 8 points (MMSE, 21/30) and his course of illness was considered consistent with mild progressive dementia. Mr P lives with Mr C, a cousin who is also his primary caregiver. Mr P has no children and all other family lives in Mexico. His caregiver is employed full time, which requires that Mr P stay at home alone. Mr P relies on his caregiver to organize and administer his 13 medications and to perform instrumental activities such as shopping and cooking. He dresses and bathes independently.Mr P maintained a positive mood as his disease progressed. He lacked insight into his memory problems. Neuropsychological testing revealed major impairments in executive function, verbal and spatial memory, wordfinding ability, and recall. His other diagnoses included hypertension, type 2 diabetes mellitus, lower extremity peripheral neuropathy, and coronary artery disease. Mr P's dementia progressed, he napped excessively during the day, experienced nighttime restlessness, and frequently awakened Mr C. Additionally, he withdrew from gardening and other previously enjoyed activities and reported feelings of insecurity and loneliness.CME available online at www.jamaarchivescme.com and questions on p 2041.