A 60-year-old man, previously a successful attorney known for his eloquence, has been experiencing progressive language difficulties over the last two years. His condition has notably affected his professional life and personal interactions. Initially, his symptoms were subtle, with occasional word-finding pauses during conversations. However, these issues have escalated: He often pauses to search for words, sometimes using placeholders like “thing” or “stuff” when he can’t find the appropriate term. His speech has become more telegraphic; he tends to omit small connecting words like articles (“a”, “the”) and verb conjugations, making his sentences short and grammatically incorrect. For example, instead of saying “I went to the store to buy some bread,” he might say, “Went store, buy bread.” He struggles significantly with understanding sentences that are structurally complex or contain multiple clauses. He can follow simple requests but becomes visibly frustrated with more complicated instructions. His speech is halting and effortful, with a noticeable reduction in fluency. There’s a tendency towards agrammatism, where his sentences lack the usual grammatical structure. Behavioral and Cognitive Observations: – Behavior:Despite his language issues, his behavior remains largely unchanged. He maintains his usual social decorum, empathy, and judgment. – Memory: His memory for daily events, personal history, and recognition of familiar faces and places is relatively preserved. Medical History: – No significant medical history: No previous neurological conditions, strokes, or traumatic brain injuries are reported. – Family History: No known family history of similar symptoms or early-onset dementia, though this has not been thoroughly explored. Physical Examination: – Neurological Exam: Apart from the language issues, the neurological examination is largely unremarkable. No motor deficits, sensory losses, or signs of Parkinsonism are noted. Question: Which subtype of frontotemporal dementia is most consistent with this patient’s presentation?