MSFinals-3123

MSFinals-3123

A 50-year-old man has been referred to a neurologist by his GP due to recent concerns with his speech. He has been experiencing difficulty verbalising his thoughts and finds this frustrating. However, there is no evidence to suggest a reduced comprehension of speech.
He struggles to repeat sentences and well-rehearsed lists (such as months of the year and numbers from one to ten). He is also unable to name common household objects presented to him. Additionally, he constructs sentences using the incorrect tense and his grammar is poor.
Imaging studies reveal that the issue is located in the frontotemporal region of the brain.
What is the most likely diagnosis?