7th June 2023

An 85-year-old man is seen in a memory clinic. His family report that his memory has been gradually

An 85-year-old man is seen in a memory clinic. His family report that his memory has been gradually and progressively declining for the past two years and that he seems ‘different’. He is impulsive, loses his temper quickly and is highly insensitive to other people’s needs, which is out of character for him. His eating habits have also changed, and he eats almost exclusively cakes and biscuits.

On cognitive testing, his short-term memory is impaired; he scores 15/30 on a MoCA, with the lowest scores being for tests of executive function. The rest of his examination is unremarkable.

What is the most likely underlying diagnosis?