Mr. C, a 75-year-old man, noticed difficulty remembering names and adding numbers after wakening while on vacation. Although these problems were quite subtle, his wife was puzzled because he seemed to have no difficulty the day before. One week later, he noted that “something was wrong” but could not describe the changes in detail. He felt that his balance was “not right” and experienced difficulty keeping track of his golf scores. Over the next few months, he developed word-finding problems and had difficulty expressing himself. He was very forgetful, had trouble problem solving, was distractible, and was unable to do simple calculations. Whereas he had previously been very reserved, he started talking with others in a more open way than he would normally have done. He continued to complain of balance problems and started to notice changes in his handwriting.